Reapply and fix r73019. BalloonViewImpl has a different implemementation on

chrome/browser/notifications/balloon_collection_impl.h

 // Copyright (c) 2010 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.
 
 // Handles the visible notification (or balloons).
 
 #ifndef CHROME_BROWSER_NOTIFICATIONS_BALLOON_COLLECTION_IMPL_H_
 #define CHROME_BROWSER_NOTIFICATIONS_BALLOON_COLLECTION_IMPL_H_
 #pragma once
 
@@ skipping 32 matching lines @@
   virtual void Add(const Notification& notification,
                    Profile* profile);
   virtual bool RemoveById(const std::string& id);
   virtual bool RemoveBySourceOrigin(const GURL& source_origin);
   virtual void RemoveAll();
   virtual bool HasSpace() const;
   virtual void ResizeBalloon(Balloon* balloon, const gfx::Size& size);
   virtual void SetPositionPreference(PositionPreference position);
   virtual void DisplayChanged();
   virtual void OnBalloonClosed(Balloon* source);
-  virtual const Balloons& GetActiveBalloons() { return base_.balloons(); }
+  virtual const Balloons& GetActiveBalloons();
 
   // MessageLoopForUI::Observer interface.
 #if defined(OS_WIN)
   virtual void WillProcessMessage(const MSG& event) {}
   virtual void DidProcessMessage(const MSG& event);
 #endif
 #if defined(OS_LINUX)
   virtual void WillProcessEvent(GdkEvent* event) {}
   virtual void DidProcessEvent(GdkEvent* event);
 #endif
@@ skipping 122 matching lines @@
   ScopedRunnableMethodFactory<BalloonCollectionImpl> reposition_factory_;
 
   // Is the balloon collection currently listening for UI events?
   bool added_as_message_loop_observer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(BalloonCollectionImpl);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_BALLOON_COLLECTION_IMPL_H_