Remove the GULLogger dependency

GoogleDataTransport.podspec

@@ -27,8 +27,6 @@ Shared library for iOS SDK data transport needs.
   s.public_header_files = 'GoogleDataTransport/GoogleDataTransport/Classes/Public/*.h'
   s.private_header_files = 'GoogleDataTransport/GoogleDataTransport/Classes/Private/*.h'
 
-  s.dependency 'GoogleUtilities/Logger'
-
   s.pod_target_xcconfig = {
     'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'GCC_TREAT_WARNINGS_AS_ERRORS' => 'YES',

GoogleDataTransport/GoogleDataTransport/DependencyWrappers/GDTConsoleLogger.m → GoogleDataTransport/GoogleDataTransport/Classes/GDTConsoleLogger.m

@@ -16,6 +16,21 @@
 
 #import "GDTConsoleLogger.h"
 
-NSString* GDTMessageCodeEnumToString(GDTMessageCode code) {
+/** The console logger prefix. */
+static NSString *kGDTConsoleLogger = @"[GoogleDataTransport]";
+
+NSString *GDTMessageCodeEnumToString(GDTMessageCode code) {
   return [[NSString alloc] initWithFormat:@"I-GDT%06ld", (long)code];
 }
+
+void GDTLog(GDTMessageCode code, NSString *format, ...) {
+// Don't log anything in not debug builds.
+#ifndef NDEBUG
+  NSString *logFormat = [NSString
+      stringWithFormat:@"%@[%@] %@", kGDTConsoleLogger, GDTMessageCodeEnumToString(code), format];
+  va_list args;
+  va_start(args, format);
+  NSLogv(logFormat, args);
+  va_end(args);
+#endif  // NDEBUG
+}

GoogleDataTransport/GoogleDataTransport/DependencyWrappers/GDTConsoleLogger.h → GoogleDataTransport/GoogleDataTransport/Classes/Private/GDTConsoleLogger.h

@@ -14,13 +14,8 @@
  * limitations under the License.
  */
 
-#import "GULLogger.h"
-
 #import "GDTAssert.h"
 
-/** The console logger prefix. */
-static GULLoggerService kGDTConsoleLogger = @"[GoogleDataTransport]";
-
 /** A list of message codes to print in the logger that help to correspond printed messages with
  * code locations.
  *
@@ -50,23 +45,21 @@ typedef NS_ENUM(NSInteger, GDTMessageCode) {
 };
 
 /** */
-FOUNDATION_EXPORT NSString *_Nonnull GDTMessageCodeEnumToString(GDTMessageCode code);
+FOUNDATION_EXPORT
+void GDTLog(GDTMessageCode code, NSString *format, ...);
 
-/** Logs the warningMessage string to the console at the warning level.
+/** Returns the string that represents some message code.
  *
- * @param warningMessageFormat The format string to log to the console.
+ * @param code The code to convert to a string.
+ * @return The string representing the message code.
  */
-FOUNDATION_EXPORT void GDTLogWarning(GDTMessageCode messageCode,
-                                     NSString *_Nonnull warningMessageFormat,
-                                     ...) NS_FORMAT_FUNCTION(2, 3);
+FOUNDATION_EXPORT NSString *_Nonnull GDTMessageCodeEnumToString(GDTMessageCode code);
 
 // A define to wrap GULLogWarning with slightly more convenient usage.
-#define GDTLogWarning(MESSAGE_CODE, MESSAGE_FORMAT, ...)                                          \
-  GULLogWarning(kGDTConsoleLogger, YES, GDTMessageCodeEnumToString(MESSAGE_CODE), MESSAGE_FORMAT, \
-                __VA_ARGS__);
+#define GDTLogWarning(MESSAGE_CODE, MESSAGE_FORMAT, ...) \
+  GDTLog(MESSAGE_CODE, MESSAGE_FORMAT, __VA_ARGS__);
 
 // A define to wrap GULLogError with slightly more convenient usage and a failing assert.
-#define GDTLogError(MESSAGE_CODE, MESSAGE_FORMAT, ...)                                          \
-  GULLogError(kGDTConsoleLogger, YES, GDTMessageCodeEnumToString(MESSAGE_CODE), MESSAGE_FORMAT, \
-              __VA_ARGS__);                                                                     \
+#define GDTLogError(MESSAGE_CODE, MESSAGE_FORMAT, ...) \
+  GDTLog(MESSAGE_CODE, MESSAGE_FORMAT, __VA_ARGS__);   \
   GDTAssert(NO, MESSAGE_FORMAT, __VA_ARGS__);