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

content/renderer/render_view_impl.cc

 // 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.
 
 #include "content/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/auto_reset.h"
@@ skipping 2847 matching lines @@
                                    const WebString& name)  {
   if (!renderer_preferences_.report_frame_name_changes)
     return;
 
   Send(new ViewHostMsg_UpdateFrameName(routing_id_,
                                        frame->identifier(),
                                        !frame->parent(),
                                        UTF16ToUTF8(name)));
 }
 
+void RenderViewImpl::cssMatches(
+    WebFrame* frame,
+    const WebVector<WebString>& newlyMatchingSelectors,
+    const WebVector<WebString>& stoppedMatchingSelectors) {
+  FOR_EACH_OBSERVER(
+      RenderViewObserver, observers_,
+      CssMatches(frame, newlyMatchingSelectors, stoppedMatchingSelectors));
+}
+
 void RenderViewImpl::loadURLExternally(
     WebFrame* frame, const WebURLRequest& request,
     WebNavigationPolicy policy) {
   loadURLExternally(frame, request, policy, WebString());
 }
 
 void RenderViewImpl::Repaint(const gfx::Size& size) {
   OnRepaint(size);
 }
 
@@ skipping 3797 matching lines @@
   TransportDIB* dib = TransportDIB::CreateWithHandle(dib_handle);
   RenderProcess::current()->ReleaseTransportDIB(dib);
 }
 
 void RenderViewImpl::DidCommitCompositorFrame() {
   RenderWidget::DidCommitCompositorFrame();
   FOR_EACH_OBSERVER(RenderViewObserver, observers_, DidCommitCompositorFrame());
 }
 
 }  // namespace content