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

ui/wm/public/cursor_delegate.cc

Index: ui/wm/public/cursor_delegate.cc
diff --git a/ui/wm/public/cursor_delegate.cc b/ui/wm/public/cursor_delegate.cc
deleted file mode 100644
index bea259d5cdb8408cf01d7eed2a18eafc57ffe7b4..0000000000000000000000000000000000000000
--- a/ui/wm/public/cursor_delegate.cc
+++ /dev/null
@@ -1,24 +0,0 @@
-// 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 "ui/wm/public/cursor_delegate.h"
-
-#include "ui/aura/window.h"
-#include "ui/aura/window_property.h"
-
-DECLARE_WINDOW_PROPERTY_TYPE(wm::CursorDelegate*);
-
-namespace wm {
-
-DEFINE_LOCAL_WINDOW_PROPERTY_KEY(CursorDelegate*, kCursorDelegateKey, NULL);
-
-void SetCursorDelegate(aura::Window* window, CursorDelegate* delegate) {
-  window->SetProperty(kCursorDelegateKey, delegate);
-}
-
-CursorDelegate* GetCursorDelegate(aura::Window* window) {
-  return window ? window->GetProperty(kCursorDelegateKey) : NULL;
-}
-
-}  // namespace wm