Remove obsolete GuestWebContentsObserver reference

chrome/browser/guest_view/guest_view_manager.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_GUEST_VIEW_GUEST_VIEW_MANAGER_H_
 #define CHROME_BROWSER_GUEST_VIEW_GUEST_VIEW_MANAGER_H_
 
 #include <map>
 
 #include "base/gtest_prod_util.h"
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "content/public/browser/browser_plugin_guest_manager.h"
 #include "content/public/browser/site_instance.h"
 #include "content/public/browser/web_contents.h"
 
 class AppViewGuest;
 class GuestViewBase;
 class GuestViewManagerFactory;
-class GuestWebContentsObserver;
 class GURL;
 
 namespace content {
 class BrowserContext;
 }  // namespace content
 
 namespace guestview {
 class TestGuestViewManager;
 }  // namespace guestview
 
@@ skipping 43 matching lines @@
   virtual void MaybeGetGuestByInstanceIDOrKill(
       int guest_instance_id,
       int embedder_render_process_id,
       const GuestByInstanceIDCallback& callback) OVERRIDE;
   virtual bool ForEachGuest(content::WebContents* embedder_web_contents,
                             const GuestCallback& callback) OVERRIDE;
 
  protected:
   friend class AppViewGuest;
   friend class GuestViewBase;
-  friend class GuestWebContentsObserver;
   friend class guestview::TestGuestViewManager;
   FRIEND_TEST_ALL_PREFIXES(GuestViewManagerTest, AddRemove);
 
   // Can be overriden in tests.
   virtual void AddGuest(int guest_instance_id,
                         content::WebContents* guest_web_contents);
 
   void RemoveGuest(int guest_instance_id);
 
   content::WebContents* GetGuestByInstanceID(int guest_instance_id);
@@ skipping 28 matching lines @@
   // The remaining instance IDs that are greater than
   // |last_instance_id_removed_| are kept here.
   std::set<int> removed_instance_ids_;
 
   content::BrowserContext* context_;
 
   DISALLOW_COPY_AND_ASSIGN(GuestViewManager);
 };
 
 #endif  // CHROME_BROWSER_GUEST_VIEW_GUEST_VIEW_MANAGER_H_