Remove implementation of Panels on OSes other than ChromeOS.

chrome/browser/ui/panels/panel_mouse_watcher.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_UI_PANELS_PANEL_MOUSE_WATCHER_H_
-#define CHROME_BROWSER_UI_PANELS_PANEL_MOUSE_WATCHER_H_
-
-#include "base/gtest_prod_util.h"
-#include "base/observer_list.h"
-
-namespace gfx {
-class Point;
-}
-
-class PanelMouseWatcherObserver;
-
-// This is the base class for functionality to watch for mouse movements.
-// The specific implementation of this abstract class differ in how they
-// track mouse movements.
-class PanelMouseWatcher {
- public:
-  // Returns an instance of the platform specific implementation.
-  static PanelMouseWatcher* Create();
-
-  // clang gives an error asking for an out of line destructor.
-  virtual ~PanelMouseWatcher();
-
-  void AddObserver(PanelMouseWatcherObserver* observer);
-  void RemoveObserver(PanelMouseWatcherObserver* observer);
-
-  // Returns current mouse position. This may be different from the
-  // mouse position in NotifyMouseMovement.
-  virtual gfx::Point GetMousePosition() const = 0;
-
- protected:
-  PanelMouseWatcher();
-
-  // |mouse_position| is in screen coordinates.
-  virtual void NotifyMouseMovement(const gfx::Point& mouse_position);
-
-  // Returns true if watching mouse movements.
-  virtual bool IsActive() const = 0;
-
- private:
-  friend class PanelMouseWatcherTest;
-  FRIEND_TEST_ALL_PREFIXES(PanelMouseWatcherTest, StartStopWatching);
-  friend class BasePanelBrowserTest;
-
-  // Start/stop tracking mouse movements.
-  virtual void Start() = 0;
-  virtual void Stop() = 0;
-
-  base::ObserverList<PanelMouseWatcherObserver> observers_;
-};
-
-#endif  // CHROME_BROWSER_UI_PANELS_PANEL_MOUSE_WATCHER_H_