Cleanup WebKit prefixed names for classes in css directory.

Source/core/core.gypi

Index: Source/core/core.gypi
diff --git a/Source/core/core.gypi b/Source/core/core.gypi
index 8154f561e3b215b1804aa9fcf81305dcc78de45f..1b5928fa6c92e7ff4f6411f044299a1575a2086e 100644
--- a/Source/core/core.gypi
+++ b/Source/core/core.gypi
@@ -9,19 +9,23 @@
             'css/CSSHostRule.idl',
             'css/CSSImportRule.idl',
             'css/CSSMediaRule.idl',
+            'css/CSSMixFunctionValue.idl',
             'css/CSSPageRule.idl',
             'css/CSSPrimitiveValue.idl',
+            'css/CSSRegionRule.idl',
             'css/CSSRule.idl',
             'css/CSSRuleList.idl',
             'css/CSSStyleDeclaration.idl',
             'css/CSSStyleRule.idl',
             'css/CSSStyleSheet.idl',
             'css/CSSSupportsRule.idl',
+            'css/CSSTransformValue.idl',
             # We should probably add CSSUnknownRule.idl to this list,
             # but it currently causes a compile error.
             # 'css/CSSUnknownRule.idl',
             'css/CSSValue.idl',
             'css/CSSValueList.idl',
+            'css/CSSViewportRule.idl',
             'css/Counter.idl',
             'css/FontLoader.idl',
             'css/MediaList.idl',
@@ -36,10 +40,6 @@
             'css/WebKitCSSKeyframeRule.idl',
             'css/WebKitCSSKeyframesRule.idl',
             'css/WebKitCSSMatrix.idl',
-            'css/WebKitCSSMixFunctionValue.idl',
-            'css/WebKitCSSRegionRule.idl',
-            'css/WebKitCSSTransformValue.idl',
-            'css/WebKitCSSViewportRule.idl',
             'dom/AnimationEvent.idl',
             'dom/Attr.idl',
             'dom/AutocompleteErrorEvent.idl',
@@ -579,6 +579,8 @@
             'css/CSSLineBoxContainValue.cpp',
             'css/CSSMediaRule.cpp',
             'css/CSSMediaRule.h',
+            'css/CSSMixFunctionValue.cpp',
+            'css/CSSMixFunctionValue.h',
             'css/CSSOMUtils.cpp',
             'css/CSSOMUtils.h',
             'css/CSSPageRule.cpp',
@@ -592,6 +594,8 @@
             'css/CSSProperty.cpp',
             'css/CSSPropertySourceData.cpp',
             'css/CSSReflectValue.cpp',
+            'css/CSSRegionRule.cpp',
+            'css/CSSRegionRule.h',
             'css/CSSRule.cpp',
             'css/CSSRule.h',
             'css/CSSRuleList.cpp',
@@ -601,6 +605,8 @@
             'css/CSSSelector.cpp',
             'css/CSSSelectorList.cpp',
             'css/CSSSelectorList.h',
+            'css/CSSShaderValue.cpp',
+            'css/CSSShaderValue.h',
             'css/CSSStyleDeclaration.h',
             'css/CSSStyleDeclaration.cpp',
             'css/CSSStyleRule.cpp',
@@ -609,10 +615,13 @@
             'css/CSSStyleSheet.h',
             'css/CSSSupportsRule.cpp',
             'css/CSSSupportsRule.h',
+            'css/CSSSVGDocumentValue.cpp',
+            'css/CSSSVGDocumentValue.h',
             'css/CSSTimingFunctionValue.cpp',
             'css/CSSTimingFunctionValue.h',
             'css/CSSToStyleMap.cpp',
             'css/CSSToStyleMap.h',
+            'css/CSSTransformValue.cpp',
             'css/CSSUnicodeRangeValue.cpp',
             'css/CSSUnicodeRangeValue.h',
             'css/CSSUnknownRule.h',
@@ -621,6 +630,8 @@
             'css/CSSValuePool.cpp',
             'css/CSSValuePool.h',
             'css/CSSVariableValue.h',
+            'css/CSSViewportRule.h',
+            'css/CSSViewportRule.cpp',
             'css/Counter.h',
             'css/DeprecatedStyleBuilder.cpp',
             'css/DeprecatedStyleBuilder.h',
@@ -708,17 +719,6 @@
             'css/WebKitCSSKeyframesRule.h',
             'css/WebKitCSSMatrix.cpp',
             'css/WebKitCSSMatrix.h',
-            'css/WebKitCSSMixFunctionValue.cpp',
-            'css/WebKitCSSMixFunctionValue.h',
-            'css/WebKitCSSRegionRule.cpp',
-            'css/WebKitCSSRegionRule.h',
-            'css/WebKitCSSShaderValue.cpp',
-            'css/WebKitCSSShaderValue.h',
-            'css/WebKitCSSSVGDocumentValue.cpp',
-            'css/WebKitCSSSVGDocumentValue.h',
-            'css/WebKitCSSTransformValue.cpp',
-            'css/WebKitCSSViewportRule.h',
-            'css/WebKitCSSViewportRule.cpp',
             'css/resolver/FilterOperationResolver.cpp',
             'css/resolver/FilterOperationResolver.h',
             'css/resolver/ScopedStyleResolver.cpp',