Move GetCursor() method from WindowDelegate to its own delegate interface CursorDelegate.

ui/aura/window_delegate.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 UI_AURA_WINDOW_DELEGATE_H_
 #define UI_AURA_WINDOW_DELEGATE_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "ui/aura/aura_export.h"
@@ skipping 26 matching lines @@
   // Returns the window's minimum size, or size 0,0 if there is no limit.
   virtual gfx::Size GetMinimumSize() const = 0;
 
   // Returns the window's maximum size, or size 0,0 if there is no limit.
   virtual gfx::Size GetMaximumSize() const = 0;
 
   // Called when the Window's position and/or size changes.
   virtual void OnBoundsChanged(const gfx::Rect& old_bounds,
                                const gfx::Rect& new_bounds) = 0;
 
-  // Returns the native cursor for the specified point, in window coordinates,
-  // or NULL for the default cursor.
-  virtual gfx::NativeCursor GetCursor(const gfx::Point& point) = 0;
-
   // Returns the non-client component (see hit_test.h) containing |point|, in
   // window coordinates.
   virtual int GetNonClientComponent(const gfx::Point& point) const = 0;
 
   // Returns true if event handling should descend into |child|. |location| is
   // in terms of the Window.
   virtual bool ShouldDescendIntoChildForEventHandling(
       Window* child,
       const gfx::Point& location) = 0;
 
@@ skipping 46 matching lines @@
   // SetTextureMailbox / SetDelegatedFrame was called).
   virtual void DidRecreateLayer(ui::Layer* old_layer, ui::Layer* new_layer) = 0;
 
  protected:
   virtual ~WindowDelegate() {}
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_DELEGATE_H_