Using the new webkit CSS change notification instead of a mutation observer.

content/renderer/render_view_impl.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 #define CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 527 matching lines @@
       WebKit::WebFrame* frame,
       WebKit::WebApplicationCacheHostClient* client);
   virtual WebKit::WebCookieJar* cookieJar(WebKit::WebFrame* frame);
   virtual void didCreateFrame(WebKit::WebFrame* parent,
                               WebKit::WebFrame* child);
   virtual void didDisownOpener(WebKit::WebFrame* frame);
   virtual void frameDetached(WebKit::WebFrame* frame);
   virtual void willClose(WebKit::WebFrame* frame);
   virtual void didChangeName(WebKit::WebFrame* frame,
                              const WebKit::WebString& name);
+  virtual void cssMatches(
+      WebKit::WebFrame* frame,
+      const WebKit::WebVector<WebKit::WebString>& newlyMatchingSelectors,
+      const WebKit::WebVector<WebKit::WebString>& stoppedMatchingSelectors);
   virtual void loadURLExternally(WebKit::WebFrame* frame,
                                  const WebKit::WebURLRequest& request,
                                  WebKit::WebNavigationPolicy policy);
   virtual void loadURLExternally(WebKit::WebFrame* frame,
                                  const WebKit::WebURLRequest& request,
                                  WebKit::WebNavigationPolicy policy,
                                  const WebKit::WebString& suggested_name);
   virtual WebKit::WebNavigationPolicy decidePolicyForNavigation(
       WebKit::WebFrame* frame,
       const WebKit::WebURLRequest& request,
@@ skipping 1045 matching lines @@
   // use the Observer interface to filter IPC messages and receive frame change
   // notifications.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_