Remove redundant imports from front_end

Very often there were two imports of the same URI, one of which also
had a `show` combinator. I opted to remove the other one.

Bug: #44569
Change-Id: I1263c892f94f0645fda6dee371dfc1fcddcd2344
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/213846
Reviewed-by: Johnni Winther <[email protected]>
Commit-Queue: Samuel Rawlins <[email protected]>

Author: srawlins

pkg/front_end/lib/src/fasta/incremental_compiler.dart

@@ -10,7 +10,6 @@ import 'package:_fe_analyzer_shared/src/scanner/abstract_scanner.dart'
     show ScannerConfiguration;
 
 import 'package:front_end/src/api_prototype/experimental_flags.dart';
-import 'package:front_end/src/api_prototype/front_end.dart';
 
 import 'package:front_end/src/api_prototype/lowering_predicates.dart'
     show isExtensionThisName;

pkg/front_end/lib/src/fasta/kernel/constant_evaluator.dart

@@ -24,7 +24,6 @@ import 'package:kernel/ast.dart';
 import 'package:kernel/class_hierarchy.dart';
 import 'package:kernel/clone.dart';
 import 'package:kernel/core_types.dart';
-import 'package:kernel/kernel.dart';
 import 'package:kernel/src/const_canonical_type.dart';
 import 'package:kernel/src/legacy_erasure.dart';
 import 'package:kernel/src/norm.dart';

pkg/front_end/test/id_testing/id_testing_test.dart

@@ -7,7 +7,6 @@
 import 'package:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
 import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
     show DataInterpreter, StringDataInterpreter, runTests;
-import 'package:_fe_analyzer_shared/src/testing/id_testing.dart';
 import 'dart:io' show Directory, Platform;
 import 'package:front_end/src/fasta/messages.dart' show FormattedMessage;
 import 'package:front_end/src/testing/id_testing_helper.dart'

pkg/front_end/test/id_tests/assigned_variables_test.dart

@@ -11,7 +11,6 @@ import 'package:_fe_analyzer_shared/src/testing/id.dart'
     show ActualData, Id, IdKind;
 import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
     show DataInterpreter, runTests;
-import 'package:_fe_analyzer_shared/src/testing/id_testing.dart';
 import 'package:front_end/src/fasta/builder/member_builder.dart';
 import 'package:front_end/src/fasta/source/source_loader.dart';
 

pkg/front_end/test/id_tests/constant_test.dart

@@ -8,7 +8,6 @@ import 'dart:io' show Directory, Platform;
 import 'package:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
 import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
     show DataInterpreter, StringDataInterpreter, runTests;
-import 'package:_fe_analyzer_shared/src/testing/id_testing.dart';
 import 'package:front_end/src/testing/id_testing_helper.dart'
     show
         CfeDataExtractor,

pkg/front_end/test/id_tests/inferred_type_arguments_test.dart

@@ -8,7 +8,6 @@ import 'dart:io' show Directory, Platform;
 import 'package:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
 import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
     show DataInterpreter, runTests;
-import 'package:_fe_analyzer_shared/src/testing/id_testing.dart';
 import 'package:front_end/src/fasta/builder/member_builder.dart';
 import 'package:front_end/src/fasta/type_inference/type_inference_engine.dart';
 import 'package:front_end/src/testing/id_testing_helper.dart';

pkg/front_end/test/id_tests/inferred_variable_types_test.dart

@@ -8,7 +8,6 @@ import 'dart:io' show Directory, Platform;
 import 'package:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
 import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
     show DataInterpreter, runTests;
-import 'package:_fe_analyzer_shared/src/testing/id_testing.dart';
 import 'package:front_end/src/fasta/builder/member_builder.dart';
 import 'package:front_end/src/fasta/type_inference/type_inference_engine.dart';
 import 'package:front_end/src/testing/id_testing_helper.dart';

pkg/front_end/test/id_tests/reachability_test.dart

@@ -8,7 +8,6 @@ import 'dart:io' show Directory, Platform;
 import 'package:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
 import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
     show DataInterpreter, runTests;
-import 'package:_fe_analyzer_shared/src/testing/id_testing.dart';
 import 'package:front_end/src/testing/id_testing_helper.dart';
 import 'package:front_end/src/fasta/builder/member_builder.dart';
 import 'package:front_end/src/fasta/source/source_loader.dart';

pkg/front_end/test/id_tests/type_promotion_test.dart

@@ -8,7 +8,6 @@ import 'dart:io' show Directory, Platform;
 import 'package:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
 import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
     show DataInterpreter, runTests;
-import 'package:_fe_analyzer_shared/src/testing/id_testing.dart';
 import 'package:front_end/src/testing/id_testing_helper.dart';
 import 'package:front_end/src/testing/id_testing_utils.dart';
 import 'package:kernel/ast.dart' hide Variance;

pkg/front_end/test/id_tests/why_not_promoted_test.dart

@@ -9,7 +9,6 @@ import 'dart:io' show Directory, Platform;
 import 'package:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
 import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
     show DataInterpreter, runTests;
-import 'package:_fe_analyzer_shared/src/testing/id_testing.dart';
 import 'package:front_end/src/fasta/builder/member_builder.dart';
 import 'package:front_end/src/fasta/type_inference/type_inference_engine.dart';
 import 'package:front_end/src/testing/id_testing_helper.dart';

pkg/front_end/test/lint_suite.dart

@@ -15,8 +15,6 @@ import 'package:_fe_analyzer_shared/src/parser/listener.dart' show Listener;
 
 import 'package:_fe_analyzer_shared/src/scanner/token.dart' show Token;
 
-import 'package:_fe_analyzer_shared/src/scanner/token.dart';
-
 import 'package:_fe_analyzer_shared/src/scanner/utf8_bytes_scanner.dart'
     show Utf8BytesScanner;
 

pkg/front_end/test/predicates/predicate_test.dart

@@ -8,7 +8,6 @@ import 'dart:io' show Directory, Platform;
 import 'package:_fe_analyzer_shared/src/testing/id.dart';
 import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
     show DataInterpreter, runTests;
-import 'package:_fe_analyzer_shared/src/testing/id_testing.dart';
 import 'package:_fe_analyzer_shared/src/testing/features.dart';
 import 'package:front_end/src/api_prototype/experimental_flags.dart';
 import 'package:front_end/src/base/nnbd_mode.dart';

pkg/front_end/tool/perf.dart

@@ -28,7 +28,6 @@ import 'package:analyzer/src/dart/sdk/sdk.dart' show FolderBasedDartSdk;
 import 'package:analyzer/src/file_system/file_system.dart';
 import 'package:analyzer/src/generated/parser.dart';
 import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/source/package_map_resolver.dart';
 import 'package:path/path.dart' as path;