Remove some pass-thrus on RootWindow API in favor of exposing the RootWindowHost again.

ui/aura/root_window_host_win.h

Index: ui/aura/root_window_host_win.h
diff --git a/ui/aura/root_window_host_win.h b/ui/aura/root_window_host_win.h
index 7a6677598617fcb877956080a6b21903e96132d5..64215a79158a525e8efe8ea5fa76e62d542a8189 100644
--- a/ui/aura/root_window_host_win.h
+++ b/ui/aura/root_window_host_win.h
@@ -17,7 +17,6 @@ class RootWindowHostWin : public RootWindowHost, public gfx::WindowImpl {
   RootWindowHostWin(const gfx::Rect& bounds);
   virtual ~RootWindowHostWin();
   // RootWindowHost:
-  virtual void SetDelegate(RootWindowHostDelegate* delegate) OVERRIDE;
   virtual RootWindow* GetRootWindow() OVERRIDE;
   virtual gfx::AcceleratedWidget GetAcceleratedWidget() OVERRIDE;
   virtual void Show() OVERRIDE;
@@ -36,7 +35,6 @@ class RootWindowHostWin : public RootWindowHost, public gfx::WindowImpl {
   virtual void UnConfineCursor() OVERRIDE;
   virtual void OnCursorVisibilityChanged(bool show) OVERRIDE;
   virtual void MoveCursorTo(const gfx::Point& location) OVERRIDE;
-  virtual void SetFocusWhenShown(bool focus_when_shown) OVERRIDE;
   virtual void PostNativeEvent(const base::NativeEvent& native_event) OVERRIDE;
   virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE;
   virtual void PrepareForShutdown() OVERRIDE;
@@ -75,8 +73,6 @@ class RootWindowHostWin : public RootWindowHost, public gfx::WindowImpl {
   void OnPaint(HDC dc);
   void OnSize(UINT param, const CSize& size);
 
-  RootWindowHostDelegate* delegate_;
-
   bool fullscreen_;
   bool has_capture_;
   RECT saved_window_rect_;