Remove balloon notification code. The last user was the Linux GTK port but that's deleted now.

chrome/browser/notifications/fake_balloon_view.h

-// Copyright (c) 2012 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_NOTIFICATIONS_FAKE_BALLOON_VIEW_H_
-#define CHROME_BROWSER_NOTIFICATIONS_FAKE_BALLOON_VIEW_H_
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "chrome/browser/notifications/balloon.h"
-
-// Test version of a balloon view which doesn't do anything viewable, but does
-// know how to close itself the same as a regular BalloonView.
-class FakeBalloonView : public BalloonView {
- public:
-  explicit FakeBalloonView(Balloon* balloon);
-  virtual ~FakeBalloonView();
-
- private:
-  // Overridden from BalloonView:
-  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;
-
-  // Non-owned pointer.
-  Balloon* balloon_;
-
-  DISALLOW_COPY_AND_ASSIGN(FakeBalloonView);
-};
-
-#endif  // CHROME_BROWSER_NOTIFICATIONS_FAKE_BALLOON_VIEW_H_