Refactoring the ownership of ui::InputMethod.

ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
index 0807934dbf915d60348559e88bf0fdcc5b9b5aae..e11a2670bdb3246d2c7e2148a2efe3b3d4dc5108 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
@@ -37,7 +37,6 @@
 #include "ui/views/win/fullscreen_handler.h"
 #include "ui/views/win/hwnd_message_handler.h"
 #include "ui/wm/core/compound_event_filter.h"
-#include "ui/wm/core/input_method_event_filter.h"
 #include "ui/wm/core/window_animations.h"
 #include "ui/wm/public/scoped_tooltip_disabler.h"
 
@@ -553,13 +552,6 @@ void DesktopWindowTreeHostWin::MoveCursorToNative(const gfx::Point& location) {
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-// DesktopWindowTreeHostWin, ui::EventSource implementation:
-
-ui::EventProcessor* DesktopWindowTreeHostWin::GetEventProcessor() {
-  return dispatcher();
-}
-
-////////////////////////////////////////////////////////////////////////////////
 // DesktopWindowTreeHostWin, aura::AnimationHost implementation:
 
 void DesktopWindowTreeHostWin::SetHostTransitionOffsets(
@@ -679,10 +671,6 @@ gfx::NativeViewAccessible DesktopWindowTreeHostWin::GetNativeViewAccessible() {
   return GetWidget()->GetRootView()->GetNativeViewAccessible();
 }
 
-InputMethod* DesktopWindowTreeHostWin::GetInputMethod() {
-  return GetWidget()->GetInputMethodDirect();
-}
-
 bool DesktopWindowTreeHostWin::ShouldHandleSystemCommands() const {
   return GetWidget()->widget_delegate()->ShouldHandleSystemCommands();
 }
@@ -856,15 +844,13 @@ bool DesktopWindowTreeHostWin::HandleIMEMessage(UINT message,
   msg.message = message;
   msg.wParam = w_param;
   msg.lParam = l_param;
-  return desktop_native_widget_aura_->input_method_event_filter()->
-      input_method()->OnUntranslatedIMEMessage(msg, result);
+  return GetInputMethod()->OnUntranslatedIMEMessage(msg, result);
 }
 
 void DesktopWindowTreeHostWin::HandleInputLanguageChange(
     DWORD character_set,
     HKL input_language_id) {
-  desktop_native_widget_aura_->input_method_event_filter()->
-      input_method()->OnInputLocaleChanged();
+  GetInputMethod()->OnInputLocaleChanged();
 }
 
 void DesktopWindowTreeHostWin::HandlePaintAccelerated(