Makes DesktopWindowTreeHostXxx to dispatch key event to 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 93b3c5b81fb0927a6134015c583a1dbee7f7c4a3..17888bc6231a09272613d6b8f396624cc045a599 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
@@ -804,15 +804,9 @@ bool DesktopWindowTreeHostWin::HandleMouseEvent(const ui::MouseEvent& event) {
   return event.handled();
 }
 
-bool DesktopWindowTreeHostWin::HandleKeyEvent(const ui::KeyEvent& event) {
-  return false;
-}
-
-bool DesktopWindowTreeHostWin::HandleUntranslatedKeyEvent(
-    const ui::KeyEvent& event) {
-  ui::KeyEvent duplicate_event(event);
-  SendEventToProcessor(&duplicate_event);
-  return duplicate_event.handled();
+void DesktopWindowTreeHostWin::HandleKeyEvent(ui::KeyEvent* event) {
+  GetInputMethod()->DispatchKeyEvent(*event);
+  event->StopPropagation();
 }
 
 void DesktopWindowTreeHostWin::HandleTouchEvent(