Refactoring the ownership of ui::InputMethod.

ui/aura/window_tree_host_x11.h

Index: ui/aura/window_tree_host_x11.h
diff --git a/ui/aura/window_tree_host_x11.h b/ui/aura/window_tree_host_x11.h
index a37f89c4234e33441cd519b4de36587f7298a440..fa4dd36ac4e38dc1c4a399b7650b2771048b169d 100644
--- a/ui/aura/window_tree_host_x11.h
+++ b/ui/aura/window_tree_host_x11.h
@@ -30,7 +30,6 @@ class TouchEventCalibrate;
 }
 
 class AURA_EXPORT WindowTreeHostX11 : public WindowTreeHost,
-                                      public ui::EventSource,
                                       public ui::PlatformEventDispatcher {
 
  public:
@@ -55,9 +54,6 @@ class AURA_EXPORT WindowTreeHostX11 : public WindowTreeHost,
   void MoveCursorToNative(const gfx::Point& location) override;
   void OnCursorVisibilityChangedNative(bool show) override;
 
-  // ui::EventSource overrides.
-  ui::EventProcessor* GetEventProcessor() override;
-
  protected:
   // Called when X Configure Notify event is recevied.
   virtual void OnConfigureNotify();