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

chrome/renderer/extensions/dispatcher.cc

Index: chrome/renderer/extensions/dispatcher.cc
diff --git a/chrome/renderer/extensions/dispatcher.cc b/chrome/renderer/extensions/dispatcher.cc
index dcd161f2882601b4a22f1d81bddf5703b8b32d0c..879a129bda07a2c321df2f051462accd0a0fb59b 100644
--- a/chrome/renderer/extensions/dispatcher.cc
+++ b/chrome/renderer/extensions/dispatcher.cc
@@ -319,7 +319,10 @@ static v8::Handle<v8::Object> GetOrCreateChrome(
 }  // namespace
 
 Dispatcher::Dispatcher()
-    : content_watcher_(new ContentWatcher(this)),
+    : content_watcher_(new ContentWatcher(this)),  // TODO(jyasskin):
+                                                   // Move this to
+                                                   // ExtensionHelper
+                                                   // if possible.
       is_webkit_initialized_(false),
       webrequest_adblock_(false),
       webrequest_adblock_plus_(false),
@@ -574,8 +577,6 @@ void Dispatcher::RegisterNativeHandlers(ModuleSystem* module_system,
   module_system->RegisterNativeHandler("setIcon",
       scoped_ptr<NativeHandler>(
           new SetIconNatives(this, request_sender_.get())));
-  module_system->RegisterNativeHandler("contentWatcherNative",
-                                       content_watcher_->MakeNatives());
 
   // Natives used by multiple APIs.
   module_system->RegisterNativeHandler("file_system_natives",
@@ -889,6 +890,15 @@ void Dispatcher::DidCreateDocumentElement(WebKit::WebFrame* frame) {
   content_watcher_->DidCreateDocumentElement(frame);
 }
 
+void Dispatcher::CssMatches(
+    WebKit::WebFrame* frame,
+    const WebKit::WebVector<WebKit::WebString>& newlyMatchingSelectors,
+    const WebKit::WebVector<WebKit::WebString>& stoppedMatchingSelectors) {
+  content_watcher_->CssMatches(frame, newlyMatchingSelectors,
+                               stoppedMatchingSelectors);
+}
+
+
 void Dispatcher::OnActivateExtension(const std::string& extension_id) {
   active_extension_ids_.insert(extension_id);
   const Extension* extension = extensions_.GetByID(extension_id);