Refactoring the ownership of ui::InputMethod.

ash/display/display_controller.h

Index: ash/display/display_controller.h
diff --git a/ash/display/display_controller.h b/ash/display/display_controller.h
index bb476ef4369ff559f1f84caf202252f23bcb5636..f031dc31b51e4db78e2d3a4a05047023585768be 100644
--- a/ash/display/display_controller.h
+++ b/ash/display/display_controller.h
@@ -19,6 +19,7 @@
 #include "base/time/time.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host_observer.h"
+#include "ui/base/ime/input_method.h"
 #include "ui/gfx/display_observer.h"
 #include "ui/gfx/geometry/point.h"
 
@@ -218,6 +219,8 @@ class ASH_EXPORT DisplayController : public gfx::DisplayObserver,
   scoped_ptr<CursorWindowController> cursor_window_controller_;
   scoped_ptr<MirrorWindowController> mirror_window_controller_;
 
+  scoped_ptr<ui::InputMethod> input_method_;
+
   // Stores the current cursor location (in native coordinates and screen
   // coordinates respectively). The locations are used to restore the cursor
   // location when the display configuration changes and to determine whether