ChromeContentRendererClient should not rely on Dispatcher::is_extension_process

extensions/renderer/dispatcher.h

Index: extensions/renderer/dispatcher.h
diff --git a/extensions/renderer/dispatcher.h b/extensions/renderer/dispatcher.h
index 44cb751a01e67321327e4affb5f6d52651b6f233..2e976a4db42517e8658da8ee2d8e8c6bd22c85de 100644
--- a/extensions/renderer/dispatcher.h
+++ b/extensions/renderer/dispatcher.h
@@ -72,8 +72,6 @@ class Dispatcher : public content::RenderProcessObserver,
     return function_names_;
   }
 
-  bool is_extension_process() const { return is_extension_process_; }
-
   const ExtensionSet* extensions() const { return &extensions_; }
 
   const ScriptContextSet& script_context_set() const {
@@ -267,8 +265,8 @@ class Dispatcher : public content::RenderProcessObserver,
   // Dispatcher's own lifetime.
   DispatcherDelegate* delegate_;
 
-  // True if this renderer is running extensions.
-  bool is_extension_process_;
+  // True if the IdleNotification timer should be set.
+  bool set_idle_notifications_;
 
   // Contains all loaded extensions.  This is essentially the renderer
   // counterpart to ExtensionService in the browser. It contains information