bindings: Makes CSSRule inherit from ScriptWrappable.

Source/bindings/core/v8/custom/custom.gypi

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
     'variables': {
         'bindings_core_v8_custom_files': [
             'V8BlobCustom.cpp',
             'V8BlobCustomHelpers.cpp',
             'V8BlobCustomHelpers.h',
-            'V8CSSRuleCustom.cpp',
             'V8CSSStyleDeclarationCustom.cpp',
             'V8CSSValueCustom.cpp',
             'V8CanvasRenderingContext2DCustom.cpp',
             'V8CustomEventCustom.cpp',
             'V8CustomXPathNSResolver.cpp',
             'V8CustomXPathNSResolver.h',
             'V8DedicatedWorkerGlobalScopeCustom.cpp',
             'V8DocumentCustom.cpp',
             'V8ElementCustom.cpp',
             'V8ErrorEventCustom.cpp',
@@ skipping 19 matching lines @@
             'V8PopStateEventCustom.cpp',
             'V8WebGLRenderingContextCustom.cpp',
             'V8WindowCustom.cpp',
             'V8WorkerCustom.cpp',
             'V8WorkerGlobalScopeCustom.cpp',
             'V8XMLHttpRequestCustom.cpp',
             'V8XSLTProcessorCustom.cpp',
         ],
     },
 }