Schedule idle handler based on CPU usage.

chrome/renderer/extensions/extension_dispatcher.h

Index: chrome/renderer/extensions/extension_dispatcher.h
diff --git a/chrome/renderer/extensions/extension_dispatcher.h b/chrome/renderer/extensions/extension_dispatcher.h
index 6f3289892293c46557f6ff9974fa8543007f7a88..6e3dbf71338e4323cae965e6aff1905c98f45f95 100644
--- a/chrome/renderer/extensions/extension_dispatcher.h
+++ b/chrome/renderer/extensions/extension_dispatcher.h
@@ -90,7 +90,6 @@ class ExtensionDispatcher : public content::RenderProcessObserver {
   // RenderProcessObserver implementation:
   virtual bool OnControlMessageReceived(const IPC::Message& message);
   virtual void WebKitInitialized();
-  virtual void IdleNotification();
 
   void OnMessageInvoke(const std::string& extension_id,
                        const std::string& function_name,
@@ -144,10 +143,6 @@ class ExtensionDispatcher : public content::RenderProcessObserver {
 
   scoped_ptr<UserScriptSlave> user_script_slave_;
 
-  // Same as above, but on a longer timer and will run even if the process is
-  // not idle, to ensure that IdleHandle gets called eventually.
-  base::RepeatingTimer<content::RenderThread> forced_idle_timer_;
-
   // The v8 extensions which are restricted to extension-related contexts.
   std::set<std::string> restricted_v8_extensions_;