Introdcue AshWindowTreeHost and move ash/chrome specific code in WTH to ash.

mojo/examples/aura_demo/window_tree_host_mojo.h

Index: mojo/examples/aura_demo/window_tree_host_mojo.h
diff --git a/mojo/examples/aura_demo/window_tree_host_mojo.h b/mojo/examples/aura_demo/window_tree_host_mojo.h
index 538c16d6de06085afb18ab9c89f83629b1c63641..80d178ccea3e0f0b45981e0c4461797f3a9db5f9 100644
--- a/mojo/examples/aura_demo/window_tree_host_mojo.h
+++ b/mojo/examples/aura_demo/window_tree_host_mojo.h
@@ -36,17 +36,12 @@ class WindowTreeHostMojo : public aura::WindowTreeHost,
   virtual gfx::AcceleratedWidget GetAcceleratedWidget() OVERRIDE;
   virtual void Show() OVERRIDE;
   virtual void Hide() OVERRIDE;
-  virtual void ToggleFullScreen() OVERRIDE;
   virtual gfx::Rect GetBounds() const OVERRIDE;
   virtual void SetBounds(const gfx::Rect& bounds) OVERRIDE;
-  virtual gfx::Insets GetInsets() const OVERRIDE;
-  virtual void SetInsets(const gfx::Insets& insets) OVERRIDE;
   virtual gfx::Point GetLocationOnNativeScreen() const OVERRIDE;
   virtual void SetCapture() OVERRIDE;
   virtual void ReleaseCapture() OVERRIDE;
   virtual bool QueryMouseLocation(gfx::Point* location_return) OVERRIDE;
-  virtual bool ConfineCursorToRootWindow() OVERRIDE;
-  virtual void UnConfineCursor() 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;