Generate CSSPropertyEquality instead of using hand-updated file.

third_party/WebKit/Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/KeyframeEffect.idl',
             'animation/EffectModel.idl',
             'animation/AnimationEffectReadOnly.idl',
@@ skipping 1071 matching lines @@
             'animation/animatable/AnimatableValueKeyframe.h',
             'animation/animatable/AnimatableVisibility.cpp',
             'animation/animatable/AnimatableVisibility.h',
             'animation/css/CSSAnimatableValueFactory.cpp',
             'animation/css/CSSAnimatableValueFactory.h',
             'animation/css/CSSAnimationData.cpp',
             'animation/css/CSSAnimationData.h',
             'animation/css/CSSAnimations.cpp',
             'animation/css/CSSAnimations.h',
             'animation/css/CSSAnimationUpdate.h',
-            'animation/css/CSSPropertyEquality.cpp',
-            'animation/css/CSSPropertyEquality.h',
             'animation/css/CSSTimingData.cpp',
             'animation/css/CSSTimingData.h',
             'animation/css/CSSTransitionData.cpp',
             'animation/css/CSSTransitionData.h',
             'clipboard/DataObject.cpp',
             'clipboard/DataObject.h',
             'clipboard/DataObjectItem.cpp',
             'clipboard/DataObjectItem.h',
             'clipboard/DataTransfer.cpp',
             'clipboard/DataTransfer.h',
@@ skipping 84 matching lines @@
             'css/CSSPaintValue.cpp',
             'css/CSSPaintValue.h',
             'css/CSSPageRule.cpp',
             'css/CSSPageRule.h',
             'css/CSSPathValue.cpp',
             'css/CSSPathValue.h',
             'css/CSSPrimitiveValue.cpp',
             'css/CSSPrimitiveValueMappings.h',
             'css/CSSProperty.cpp',
             'css/CSSPropertySourceData.cpp',
+            'css/CSSPropertyEqualityCustom.cpp',
+            'css/CSSPropertyEquality.h',
             'css/CSSQuadValue.cpp',
             'css/CSSQuadValue.h',
             'css/CSSReflectValue.cpp',
             'css/CSSRule.cpp',
             'css/CSSRule.h',
             'css/CSSRuleList.cpp',
             'css/CSSRuleList.h',
             'css/CSSSVGDocumentValue.cpp',
             'css/CSSSVGDocumentValue.h',
             'css/CSSSegmentedFontFace.cpp',
@@ skipping 2901 matching lines @@
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'workers/WorkerThreadTestHelper.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }