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

ui/aura/root_window_host_x11.h

Index: ui/aura/root_window_host_x11.h
diff --git a/ui/aura/root_window_host_x11.h b/ui/aura/root_window_host_x11.h
index 3f14b8328486df54df37d0be5223837091cd9e64..e8593e610a874dd6e992df3f497dd2940113c2c2 100644
--- a/ui/aura/root_window_host_x11.h
+++ b/ui/aura/root_window_host_x11.h
@@ -43,7 +43,6 @@ class AURA_EXPORT RootWindowHostX11 : public RootWindowHost,
   virtual bool Dispatch(const base::NativeEvent& event) OVERRIDE;
 
   // RootWindowHost Overrides.
-  virtual void SetDelegate(RootWindowHostDelegate* delegate) OVERRIDE;
   virtual RootWindow* GetRootWindow() OVERRIDE;
   virtual gfx::AcceleratedWidget GetAcceleratedWidget() OVERRIDE;
   virtual void Show() OVERRIDE;
@@ -62,7 +61,6 @@ class AURA_EXPORT RootWindowHostX11 : public RootWindowHost,
   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& event) OVERRIDE;
   virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE;
   virtual void PrepareForShutdown() OVERRIDE;
@@ -100,8 +98,6 @@ class AURA_EXPORT RootWindowHostX11 : public RootWindowHost,
   // turn off the Tap-to-click feature when the mouse pointer is invisible.
   void SetCrOSTapPaused(bool state);
 
-  RootWindowHostDelegate* delegate_;
-
   // The display and the native X window hosting the root window.
   XDisplay* xdisplay_;
   ::Window xwindow_;