Stop using [InterfaceName] in CSS IDL files

Source/core/core.gypi

 {
     'variables': {
         'core_idl_files': [
             'css/CSS.idl',
             'css/CSSCharsetRule.idl',
-            'css/CSSFilterRule.idl',
-            'css/CSSFilterValue.idl',
             'css/CSSFontFaceLoadEvent.idl',
             'css/CSSFontFaceRule.idl',
             'css/CSSHostRule.idl',
             'css/CSSImportRule.idl',
-            'css/CSSKeyframeRule.idl',
-            'css/CSSKeyframesRule.idl',
-            'css/CSSMatrix.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',
             'css/MediaQueryList.idl',
             'css/Rect.idl',
             'css/RGBColor.idl',
             'css/StyleMedia.idl',
             'css/StyleSheet.idl',
             'css/StyleSheetList.idl',
+            'css/WebKitCSSFilterRule.idl',
+            'css/WebKitCSSFilterValue.idl',
+            'css/WebKitCSSKeyframeRule.idl',
+            'css/WebKitCSSKeyframesRule.idl',
+            'css/WebKitCSSMatrix.idl',
+            'css/WebKitCSSMixFunctionValue.idl',
+            'css/WebKitCSSRegionRule.idl',
+            'css/WebKitCSSTransformValue.idl',
             'dom/AnimationEvent.idl',
             'dom/Attr.idl',
             'dom/AutocompleteErrorEvent.idl',
             'dom/BeforeLoadEvent.idl',
             'dom/CDATASection.idl',
             'dom/CharacterData.idl',
             'dom/ClientRect.idl',
             'dom/ClientRectList.idl',
             'dom/Clipboard.idl',
             'dom/Comment.idl',
@@ skipping 3640 matching lines @@
                 'bison_exe': 'bison',
                 # We specify a preprocess so it happens locally and won't get
                 # distributed to goma.
                 # FIXME: /usr/bin/gcc won't exist on OSX forever. We want to
                 # use /usr/bin/clang once we require Xcode 4.x.
                 'preprocessor': '--preprocessor "/usr/bin/gcc -E -P -x c++"'
               }],
          ],
     }
 }