Make SharedBuffer in Resource non-discardable and remove PurgeableVector

third_party/WebKit/Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'ContentDecryptionModuleResult.h',
@@ skipping 85 matching lines @@
       'PlatformResourceLoader.h',
       'PlatformTouchEvent.h',
       'PlatformTouchPoint.h',
       'PlatformWheelEvent.h',
       'PluginScriptForbiddenScope.cpp',
       'PluginScriptForbiddenScope.h',
       'PopupMenu.h',
       'Prerender.cpp',
       'Prerender.h',
       'PrerenderClient.h',
-      'PurgeableVector.cpp',
-      'PurgeableVector.h',
       'ScopedOrientationChangeIndicator.cpp',
       'ScopedOrientationChangeIndicator.h',
       'ScriptForbiddenScope.cpp',
       'ScriptForbiddenScope.h',
       'SecureTextInput.cpp',
       'SecureTextInput.h',
       'SerializedResource.h',
       'SharedBuffer.cpp',
       'SharedBuffer.h',
       'SharedBufferChunkReader.cpp',
@@ skipping 1102 matching lines @@
       'DragImageTest.cpp',
       'HistogramTest.cpp',
       'LayoutLocaleTest.cpp',
       'LayoutUnitTest.cpp',
       'LifecycleContextTest.cpp',
       'JSONParserTest.cpp',
       'PODArenaTest.cpp',
       'PODFreeListArenaTest.cpp',
       'PODIntervalTreeTest.cpp',
       'PODRedBlackTreeTest.cpp',
-      'PurgeableVectorTest.cpp',
       'SharedBufferTest.cpp',
       'TimerTest.cpp',
       'TracedValueTest.cpp',
       'UserGestureIndicatorTest.cpp',
       'UUIDTest.cpp',
       'WebIconSizesParserTest.cpp',
       'WebScreenInfoTest.cpp',
       'WebVectorTest.cpp',
       'animation/AnimationTranslationUtilTest.cpp',
       'animation/CompositorAnimationHostTest.cpp',
@@ skipping 215 matching lines @@
       ['use_default_render_theme==1',
         {
           'platform_test_files': [
             'scroll/ScrollbarThemeAuraTest.cpp',
           ],
         }
       ],
     ],
   },
 }