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

content/browser/web_contents/aura/image_window_delegate.cc

 // Copyright (c) 2013 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 "content/browser/web_contents/aura/image_window_delegate.h"
 
 #include "ui/base/cursor/cursor.h"
 #include "ui/base/hit_test.h"
 #include "ui/compositor/compositor.h"
 #include "ui/gfx/canvas.h"
@@ skipping 25 matching lines @@
   return gfx::Size();
 }
 
 void ImageWindowDelegate::OnBoundsChanged(const gfx::Rect& old_bounds,
                                           const gfx::Rect& new_bounds) {
   window_size_ = new_bounds.size();
   if (!image_.IsEmpty())
     size_mismatch_ = window_size_ != image_.AsImageSkia().size();
 }
 
-gfx::NativeCursor ImageWindowDelegate::GetCursor(const gfx::Point& point) {
-  return gfx::kNullCursor;
-}
-
 int ImageWindowDelegate::GetNonClientComponent(const gfx::Point& point) const {
   return HTNOWHERE;
 }
 
 bool ImageWindowDelegate::ShouldDescendIntoChildForEventHandling(
     aura::Window* child,
     const gfx::Point& location) {
   return false;
 }
 
@@ skipping 32 matching lines @@
 }
 
 void ImageWindowDelegate::GetHitTestMask(gfx::Path* mask) const {
 }
 
 void ImageWindowDelegate::DidRecreateLayer(ui::Layer *old_layer,
                                            ui::Layer *new_layer) {
 }
 
 }  // namespace content