Refactoring the ownership of ui::InputMethod.

ui/aura/window_tree_host_ozone.h

Index: ui/aura/window_tree_host_ozone.h
diff --git a/ui/aura/window_tree_host_ozone.h b/ui/aura/window_tree_host_ozone.h
index e4fcd02d936ee0ed921a4d381aa245a48c95658e..2a300eced2feeaf1772fd2758296ad20219c33dd 100644
--- a/ui/aura/window_tree_host_ozone.h
+++ b/ui/aura/window_tree_host_ozone.h
@@ -18,7 +18,6 @@ class PlatformWindow;
 namespace aura {
 
 class AURA_EXPORT WindowTreeHostOzone : public WindowTreeHost,
-                                        public ui::EventSource,
                                         public ui::PlatformWindowDelegate {
  public:
   explicit WindowTreeHostOzone(const gfx::Rect& bounds);
@@ -53,9 +52,6 @@ class AURA_EXPORT WindowTreeHostOzone : public WindowTreeHost,
   void OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget) override;
   void OnActivationChanged(bool active) override;
 
-  // ui::EventSource overrides.
-  ui::EventProcessor* GetEventProcessor() override;
-
   // Platform-specific part of this WindowTreeHost.
   scoped_ptr<ui::PlatformWindow> platform_window_;