Migrate examples to use augmentations.

Author: munificent

example/lib/example.dart

@@ -29,10 +29,6 @@ class Person {
     this.lastOrder,
     List<Order>? orders,
   }) : orders = orders ?? <Order>[];
-
-  factory Person.fromJson(Map<String, dynamic> json) => _$PersonFromJson(json);
-
-  Map<String, dynamic> toJson() => _$PersonToJson(this);
 }
 
 @JsonSerializable(includeIfNull: false)
@@ -53,10 +49,6 @@ class Order {
 
   Order(this.date);
 
-  factory Order.fromJson(Map<String, dynamic> json) => _$OrderFromJson(json);
-
-  Map<String, dynamic> toJson() => _$OrderToJson(this);
-
   static Duration? _durationFromMilliseconds(int? milliseconds) =>
       milliseconds == null ? null : Duration(milliseconds: milliseconds);
 
@@ -77,11 +69,9 @@ class Item {
   bool? isRushed;
 
   Item();
-
-  factory Item.fromJson(Map<String, dynamic> json) => _$ItemFromJson(json);
-
-  Map<String, dynamic> toJson() => _$ItemToJson(this);
 }
 
+// TODO(augment): Could model this a couple of ways, but decided to do a
+// variable declaration with no initializer.
 @JsonLiteral('data.json')
-Map get glossaryData => _$glossaryDataJsonLiteral;
+final Map glossaryData;

example/lib/example.g.dart

@@ -24,9 +24,6 @@ class BaseResponse<T> {
     this.data,
   });
 
-  factory BaseResponse.fromJson(Map<String, dynamic> json) =>
-      _$BaseResponseFromJson(json);
-
   /// Decodes [json] by "inspecting" its contents.
   static T _dataFromJson<T>(Object json) {
     if (json is Map<String, dynamic>) {
@@ -70,9 +67,6 @@ class Article {
     this.author,
     this.comments,
   });
-
-  factory Article.fromJson(Map<String, dynamic> json) =>
-      _$ArticleFromJson(json);
 }
 
 @JsonSerializable(createToJson: false)
@@ -84,8 +78,6 @@ class User {
     this.id,
     this.email,
   });
-
-  factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(json);
 }
 
 @JsonSerializable(createToJson: false)
@@ -97,7 +89,4 @@ class Comment {
     this.id,
     this.content,
   });
-
-  factory Comment.fromJson(Map<String, dynamic> json) =>
-      _$CommentFromJson(json);
 }

example/lib/generic_response_class_example.dart

@@ -16,11 +16,6 @@ class DateTimeExample {
   final DateTime when;
 
   DateTimeExample(this.when);
-
-  factory DateTimeExample.fromJson(Map<String, dynamic> json) =>
-      _$DateTimeExampleFromJson(json);
-
-  Map<String, dynamic> toJson() => _$DateTimeExampleToJson(this);
 }
 
 class _DateTimeEpochConverter implements JsonConverter<DateTime, int> {
@@ -54,11 +49,6 @@ class GenericCollection<T> {
     this.totalPages,
     this.results,
   });
-
-  factory GenericCollection.fromJson(Map<String, dynamic> json) =>
-      _$GenericCollectionFromJson<T>(json);
-
-  Map<String, dynamic> toJson() => _$GenericCollectionToJson(this);
 }
 
 class _Converter<T> implements JsonConverter<T, Object?> {
@@ -91,11 +81,6 @@ class CustomResult {
 
   CustomResult(this.name, this.size);
 
-  factory CustomResult.fromJson(Map<String, dynamic> json) =>
-      _$CustomResultFromJson(json);
-
-  Map<String, dynamic> toJson() => _$CustomResultToJson(this);
-
   @override
   bool operator ==(Object other) =>
       other is CustomResult && other.name == name && other.size == size;

example/lib/generic_response_class_example.g.dart

@@ -8,14 +8,9 @@ part 'nested_values_example.g.dart';
 class NestedValueExample {
   NestedValueExample(this.nestedValues);
 
-  factory NestedValueExample.fromJson(Map<String, dynamic> json) =>
-      _$NestedValueExampleFromJson(json);
-
   @_NestedListConverter()
   @JsonKey(name: 'root_items')
   final List<String> nestedValues;
-
-  Map<String, dynamic> toJson() => _$NestedValueExampleToJson(this);
 }
 
 class _NestedListConverter