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

ash/display/cursor_window_controller.cc

 // 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.
 
 #include "ash/display/cursor_window_controller.h"
 
 #include "ash/display/display_controller.h"
 #include "ash/display/mirror_window_controller.h"
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
@@ skipping 16 matching lines @@
 class CursorWindowDelegate : public aura::WindowDelegate {
  public:
   CursorWindowDelegate() : is_cursor_compositing_enabled_(false) {}
   virtual ~CursorWindowDelegate() {}
 
   // aura::WindowDelegate overrides:
   virtual gfx::Size GetMinimumSize() const OVERRIDE { return size_; }
   virtual gfx::Size GetMaximumSize() const OVERRIDE { return 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 { return false; }
@@ skipping 205 matching lines @@
   if (cursor_window_) {
     cursor_window_->SetBounds(gfx::Rect(delegate_->size()));
     cursor_window_->SchedulePaintInRect(
         gfx::Rect(cursor_window_->bounds().size()));
     UpdateLocation();
   }
 }
 
 }  // namespace internal
 }  // namespace ash