aura: Unify WindowTreeHost for some platforms

ui/platform_window/win/win_window.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 "ui/platform_window/win/win_window.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
@@ skipping 89 matching lines @@
 }
 
 void WinWindow::ToggleFullscreen() {}
 
 void WinWindow::Maximize() {}
 
 void WinWindow::Minimize() {}
 
 void WinWindow::Restore() {}
 
-void WinWindow::SetCursor(PlatformCursor cursor) {}
+void WinWindow::SetCursor(PlatformCursor cursor) {
+  ::SetCursor(cursor);
+}
 
 void WinWindow::MoveCursorTo(const gfx::Point& location) {}
 
 void WinWindow::ConfineCursorToBounds(const gfx::Rect& bounds) {
 }
 
 PlatformImeController* WinWindow::GetPlatformImeController() {
   return nullptr;
 }
 
@@ skipping 66 matching lines @@
 
 namespace test {
 
 // static
 void SetUsePopupAsRootWindowForTest(bool use) {
   use_popup_as_root_window_for_test = use;
 }
 
 }  // namespace test
 }  // namespace ui