aura: Remove WindowTreeHost::OnDeviceScaleFactorChanged.

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 "mojo/services/public/cpp/view_manager/node_observer.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/events/event_source.h"
@@ skipping 35 matching lines @@
   virtual ui::EventSource* GetEventSource() OVERRIDE;
   virtual gfx::AcceleratedWidget GetAcceleratedWidget() OVERRIDE;
   virtual void Show() OVERRIDE;
   virtual void Hide() OVERRIDE;
   virtual gfx::Rect GetBounds() const OVERRIDE;
   virtual void SetBounds(const gfx::Rect& bounds) OVERRIDE;
   virtual gfx::Point GetLocationOnNativeScreen() const OVERRIDE;
   virtual void SetCapture() OVERRIDE;
   virtual void ReleaseCapture() OVERRIDE;
   virtual void PostNativeEvent(const base::NativeEvent& native_event) OVERRIDE;
-  virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE;
   virtual void SetCursorNative(gfx::NativeCursor cursor) OVERRIDE;
   virtual void MoveCursorToNative(const gfx::Point& location) OVERRIDE;
   virtual void OnCursorVisibilityChangedNative(bool show) OVERRIDE;
 
   // ui::EventSource:
   virtual ui::EventProcessor* GetEventProcessor() OVERRIDE;
 
   // view_manager::NodeObserver:
   virtual void OnNodeBoundsChanged(
       view_manager::Node* node,
       const gfx::Rect& old_bounds,
       const gfx::Rect& new_bounds) OVERRIDE;
 
   view_manager::Node* node_;
 
   gfx::Rect bounds_;
 
   WindowTreeHostMojoDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowTreeHostMojo);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_EXAMPLES_AURA_DEMO_WINDOW_TREE_HOST_VIEW_MANAGER_H_