aura: Remove event-dispatch methods from WindowTreeHostDelegate interface.

mojo/examples/launcher/launcher.cc

Index: mojo/examples/launcher/launcher.cc
diff --git a/mojo/examples/launcher/launcher.cc b/mojo/examples/launcher/launcher.cc
index 6c12e0e216e4d1f79bf24b8fb1215e4f35811b8e..cb4620efa3180193830229b1dc6f318528931a24 100644
--- a/mojo/examples/launcher/launcher.cc
+++ b/mojo/examples/launcher/launcher.cc
@@ -98,8 +98,9 @@ class MinimalInputEventFilter : public ui::internal::InputMethodDelegate,
   // ui::internal::InputMethodDelegate:
   virtual bool DispatchKeyEventPostIME(const ui::KeyEvent& event) OVERRIDE {
     ui::TranslatedKeyEvent aura_event(event);
-    return root_->GetDispatcher()->AsWindowTreeHostDelegate()->OnHostKeyEvent(
-        &aura_event);
+    ui::EventDispatchDetails details =
+        root_->GetDispatcher()->OnEventFromSource(&aura_event);
+    return aura_event.handled() || details.dispatcher_destroyed;
   }
 
   aura::Window* root_;