Revert of More regular Platform implementations in unit tests (reland.)

third_party/WebKit/Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'Clock.cpp',
@@ skipping 955 matching lines @@
       'DecimalTest.cpp',
       'DragImageTest.cpp',
       'LayoutUnitTest.cpp',
       'LifecycleContextTest.cpp',
       'PODArenaTest.cpp',
       'PODFreeListArenaTest.cpp',
       'PODIntervalTreeTest.cpp',
       'PODRedBlackTreeTest.cpp',
       'PurgeableVectorTest.cpp',
       'SharedBufferTest.cpp',
+      'TestingPlatformSupport.cpp',
+      'TestingPlatformSupport.h',
       'TimerTest.cpp',
       'TracedValueTest.cpp',
       'UUIDTest.cpp',
       'WebScreenInfoTest.cpp',
       'WebVectorTest.cpp',
       'animation/TimingFunctionTest.cpp',
       'animation/UnitBezierTest.cpp',
       'blob/BlobDataTest.cpp',
       'clipboard/ClipboardUtilitiesTest.cpp',
       'fonts/FontCacheTest.cpp',
@@ skipping 83 matching lines @@
       'testing/URLTestHelpers.cpp',
       'testing/URLTestHelpers.h',
       'testing/UnitTestHelpers.cpp',
       'testing/UnitTestHelpers.h',
     ],
     'platform_test_support_files': [
       'testing/GeometryPrinters.cpp',
       'testing/GeometryPrinters.h',
       'testing/PaintPrinters.cpp',
       'testing/PaintPrinters.h',
-      'testing/TestingPlatformSupport.cpp',
-      'testing/TestingPlatformSupport.h',
       'testing/TransformPrinters.cpp',
       'testing/TransformPrinters.h',
     ],
     'conditions': [
       ['OS=="win"',
         {
           'platform_test_files': [
             'text/LocaleWinTest.cpp',
           ],
         }
@@ skipping 15 matching lines @@
       ['OS!="mac"',
         {
           'platform_test_files': [
             'scroll/ScrollAnimatorTest.cpp',
           ],
         }
       ],
     ],
   },
 }