notification balloons: Remove views and cocoa implementations of BalloonCollection.

chrome/browser/ui/cocoa/notifications/balloon_view_bridge.h

-// Copyright (c) 2011 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_UI_COCOA_NOTIFICATIONS_BALLOON_VIEW_BRIDGE_H_
-#define CHROME_BROWSER_UI_COCOA_NOTIFICATIONS_BALLOON_VIEW_BRIDGE_H_
-
-#include "chrome/browser/notifications/balloon.h"
-
-@class BalloonController;
-class BalloonHost;
-namespace gfx {
-class Size;
-}
-
-// Bridges from the cross-platform BalloonView interface to the Cocoa
-// controller which will draw the view on screen.
-class BalloonViewBridge : public BalloonView {
- public:
-  BalloonViewBridge();
-  virtual ~BalloonViewBridge();
-
-  // BalloonView interface.
-  virtual void Show(Balloon* balloon) OVERRIDE;
-  virtual void Update() OVERRIDE;
-  virtual void RepositionToBalloon() OVERRIDE;
-  virtual void Close(bool by_user) OVERRIDE;
-  virtual gfx::Size GetSize() const OVERRIDE;
-  virtual BalloonHost* GetHost() const OVERRIDE;
-
- private:
-  // Weak pointer to the balloon controller which manages the UI.
-  // This object cleans itself up when its windows close.
-  BalloonController* controller_;
-
-  DISALLOW_COPY_AND_ASSIGN(BalloonViewBridge);
-};
-
-#endif  // CHROME_BROWSER_UI_COCOA_NOTIFICATIONS_BALLOON_VIEW_BRIDGE_H_