Remove unused BrowserBubble remnants.

chrome/browser/ui/views/frame/browser_bubble_host.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.
-
-#ifndef CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_BUBBLE_HOST_H_
-#define CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_BUBBLE_HOST_H_
-#pragma once
-
-#include <set>
-
-#include "base/basictypes.h"
-
-class BrowserBubble;
-
-// A class providing a hosting environment for BrowserBubble instances.
-// Allows for notification to attached BrowserBubbles of browser move, and
-// close events.
-class BrowserBubbleHost {
- public:
-  BrowserBubbleHost();
-  ~BrowserBubbleHost();
-
-  // Invoked when the window containing the attached browser-bubbles is moved.
-  // Calls BrowserBubble::BrowserWindowMoved on all attached bubbles.
-  void WindowMoved();
-
-  // To be called when the frame containing the BrowserBubbleHost is closing.
-  // Calls BrowserBubble::BrowserWindowClosing on all attached bubbles.
-  void Close();
-
-  // Registers/Unregisters |bubble| to receive notifications when the host moves
-  // or is closed.
-  void AttachBrowserBubble(BrowserBubble* bubble);
-  void DetachBrowserBubble(BrowserBubble* bubble);
-
- private:
-  // The set of bubbles associated with this host.
-  typedef std::set<BrowserBubble*> BubbleSet;
-  BubbleSet browser_bubbles_;
-
-  DISALLOW_COPY_AND_ASSIGN(BrowserBubbleHost);
-};
-
-#endif  // CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_BUBBLE_HOST_H_