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

ash/root_window_controller.cc

 // 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.
 
 #include "ash/root_window_controller.h"
 
 #include <queue>
 #include <vector>
 
 #include "ash/ash_constants.h"
@@ skipping 203 matching lines @@
   // aura::WindowDelegate overrides:
   virtual gfx::Size GetMinimumSize() const OVERRIDE {
     return gfx::Size();
   }
   virtual gfx::Size GetMaximumSize() const OVERRIDE {
     return gfx::Size();
   }
   virtual void OnBoundsChanged(const gfx::Rect& old_bounds,
                                const gfx::Rect& new_bounds) OVERRIDE {
   }
-  virtual gfx::NativeCursor GetCursor(const gfx::Point& point) OVERRIDE {
-    return gfx::kNullCursor;
-  }
   virtual int GetNonClientComponent(
       const gfx::Point& point) const OVERRIDE {
     return HTNOWHERE;
   }
   virtual bool ShouldDescendIntoChildForEventHandling(
       aura::Window* child,
       const gfx::Point& location) OVERRIDE {
     return false;
   }
   virtual bool CanFocus() OVERRIDE {
@@ skipping 768 matching lines @@
     DisableTouchHudProjection();
 }
 
 RootWindowController* GetRootWindowController(
     const aura::Window* root_window) {
   return root_window ? GetRootWindowSettings(root_window)->controller : NULL;
 }
 
 }  // namespace internal
 }  // namespace ash