Simplify the logic in DesktopWindowTreeHostX11 for FocusOut

ui/aura/window_event_dispatcher.h

 // Copyright 2014 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 UI_AURA_WINDOW_EVENT_DISPATCHER_H_
 #define UI_AURA_WINDOW_EVENT_DISPATCHER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 89 matching lines @@
   //
   // More than one hold can be invoked and each hold must be cancelled by a
   // release before we resume normal operation.
   void HoldPointerMoves();
   void ReleasePointerMoves();
 
   // Gets the last location seen in a mouse event in this root window's
   // coordinates. This may return a point outside the root window's bounds.
   gfx::Point GetLastMouseLocationInRoot() const;
 
-  void OnHostLostMouseGrab();
   void OnCursorMovedToRootLocation(const gfx::Point& root_location);
 
   // TODO(beng): This is only needed because this cleanup needs to happen after
   //             all other observers are notified of OnWindowDestroying() but
   //             before OnWindowDestroyed() is sent (i.e. while the window
   //             hierarchy is still intact). This didn't seem worth adding a
   //             generic notification for as only this class needs to implement
   //             it. I would however like to find a way to do this via an
   //             observer.
   void OnPostNotifiedWindowDestroying(Window* window);
@@ skipping 141 matching lines @@
 
   // Used to schedule DispatchHeldEvents() when |move_hold_count_| goes to 0.
   base::WeakPtrFactory<WindowEventDispatcher> held_event_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowEventDispatcher);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_EVENT_DISPATCHER_H_