Merge CSSMarkup and CSSOMUtils

Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/Animation.idl',
             'animation/AnimationEffect.idl',
             'animation/AnimationNode.idl',
@@ skipping 733 matching lines @@
             'css/CSSKeyframeRule.h',
             'css/CSSKeyframesRule.cpp',
             'css/CSSKeyframesRule.h',
             'css/CSSLineBoxContainValue.cpp',
             'css/CSSMarkup.cpp',
             'css/CSSMarkup.h',
             'css/CSSMatrix.cpp',
             'css/CSSMatrix.h',
             'css/CSSMediaRule.cpp',
             'css/CSSMediaRule.h',
-            'css/CSSOMUtils.cpp',
-            'css/CSSOMUtils.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/CSSReflectValue.cpp',
             'css/CSSRule.cpp',
@@ skipping 3003 matching lines @@
             'rendering/style/SVGRenderStyleTest.cpp',
             'streams/ExclusiveStreamReaderTest.cpp',
             'streams/ReadableStreamTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }