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 56b900da6884a1c357a15e65b2087000f0b9a761..bc994a7eb877df92d5faa1d49221ea4f432e7da7 100644
--- a/ui/aura/window_tree_host_x11.h
+++ b/ui/aura/window_tree_host_x11.h
@@ -8,7 +8,6 @@
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/aura_export.h"
 #include "ui/aura/window_tree_host.h"
-#include "ui/events/event_source.h"
 #include "ui/events/platform/platform_event_dispatcher.h"
 #include "ui/gfx/geometry/insets.h"
 #include "ui/gfx/geometry/rect.h"
@@ -30,7 +29,6 @@ class TouchEventCalibrate;
 }
 
 class AURA_EXPORT WindowTreeHostX11 : public WindowTreeHost,
-                                      public ui::EventSource,
                                       public ui::PlatformEventDispatcher {
 
  public:
@@ -55,9 +53,6 @@ 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();