Revert 189969 "Add RenderWidgetHost::GetSnapshotFromRenderer met..."

chrome/browser/extensions/api/tabs/tabs_api.h

Index: chrome/browser/extensions/api/tabs/tabs_api.h
===================================================================
--- chrome/browser/extensions/api/tabs/tabs_api.h	(revision 190011)
+++ chrome/browser/extensions/api/tabs/tabs_api.h	(working copy)
@@ -174,7 +174,8 @@
   content::NotificationRegistrar registrar_;
   DECLARE_EXTENSION_FUNCTION("tabs.detectLanguage", TABS_DETECTLANGUAGE)
 };
-class TabsCaptureVisibleTabFunction : public AsyncExtensionFunction {
+class TabsCaptureVisibleTabFunction : public AsyncExtensionFunction,
+                                  public content::NotificationObserver {
  public:
   static void RegisterUserPrefs(PrefRegistrySyncable* registry);
 
@@ -190,18 +191,16 @@
   virtual ~TabsCaptureVisibleTabFunction() {}
   virtual bool RunImpl() OVERRIDE;
   virtual bool GetTabToCapture(content::WebContents** web_contents);
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
   void SendResultFromBitmap(const SkBitmap& screen_capture);
 
  private:
-  // Callback for the RWH::CopyFromBackingStore call.
   void CopyFromBackingStoreComplete(bool succeeded,
                                     const SkBitmap& bitmap);
 
-  // Callback for the RWH::GetSnapshotFromRenderer call. This path is used if
-  // CopyFromBackingStore fails for some reason.
-  void GetSnapshotFromRendererComplete(bool succeeded,
-                                       const SkBitmap& bitmap);
-  void SendInternalError();
+  content::NotificationRegistrar registrar_;
 
   // The format (JPEG vs PNG) of the resulting image.  Set in RunImpl().
   ImageFormat image_format_;