Refactoring for the InputMethod & InputMethodDelegate interfaces.

ui/aura/window_tree_host.cc

Index: ui/aura/window_tree_host.cc
diff --git a/ui/aura/window_tree_host.cc b/ui/aura/window_tree_host.cc
index c65c9271f4bc3bbdf7a0f6ffc03ec1d7ea6d6297..5fdadb9ebbb210ea2c3fdf3d5d2d45fc020f4f02 100644
--- a/ui/aura/window_tree_host.cc
+++ b/ui/aura/window_tree_host.cc
@@ -193,11 +193,9 @@ void WindowTreeHost::SetSharedInputMethod(ui::InputMethod* input_method) {
   owned_input_method_ = false;
 }
 
-bool WindowTreeHost::DispatchKeyEventPostIME(const ui::KeyEvent& event) {
-  ui::KeyEvent copied_event(event);
-  ui::EventDispatchDetails details = SendEventToProcessor(&copied_event);
-  DCHECK(!details.dispatcher_destroyed);
-  return copied_event.stopped_propagation();
+ui::EventDispatchDetails WindowTreeHost::DispatchKeyEventPostIME(
+    ui::KeyEvent* event) {
+  return SendEventToProcessor(event);
 }
 
 void WindowTreeHost::Show() {