Remove dependency on ui from view_manager.

mojo/aura/window_tree_host_mojo.h

 // 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.
 
 #ifndef MOJO_EXAMPLES_AURA_DEMO_WINDOW_TREE_HOST_VIEW_MANAGER_H_
 #define MOJO_EXAMPLES_AURA_DEMO_WINDOW_TREE_HOST_VIEW_MANAGER_H_
 
 #include "base/macros.h"
 #include "mojo/services/public/cpp/view_manager/view_observer.h"
 #include "ui/aura/window_tree_host.h"
@@ skipping 38 matching lines @@
   void PostNativeEvent(const base::NativeEvent& native_event) override;
   void SetCursorNative(gfx::NativeCursor cursor) override;
   void MoveCursorToNative(const gfx::Point& location) override;
   void OnCursorVisibilityChangedNative(bool show) override;
 
   // ui::EventSource:
   ui::EventProcessor* GetEventProcessor() override;
 
   // ViewObserver:
   void OnViewBoundsChanged(View* view,
-                           const gfx::Rect& old_bounds,
-                           const gfx::Rect& new_bounds) override;
+                           const Rect& old_bounds,
+                           const Rect& new_bounds) override;
 
   View* view_;
 
   gfx::Rect bounds_;
 
   scoped_ptr<SurfaceContextFactory> context_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowTreeHostMojo);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_EXAMPLES_AURA_DEMO_WINDOW_TREE_HOST_VIEW_MANAGER_H_