aura: Remove event-dispatch methods from WindowTreeHostDelegate interface.

ui/aura/test/aura_test_base.cc

Index: ui/aura/test/aura_test_base.cc
diff --git a/ui/aura/test/aura_test_base.cc b/ui/aura/test/aura_test_base.cc
index 7dfe74db48ab24c7e8a828302fe43b2eb066ae6e..f59f1411e6e66d941f0d7381ea1c45630fa38767 100644
--- a/ui/aura/test/aura_test_base.cc
+++ b/ui/aura/test/aura_test_base.cc
@@ -10,6 +10,7 @@
 #include "ui/aura/test/test_window_delegate.h"
 #include "ui/aura/window.h"
 #include "ui/base/ime/input_method_initializer.h"
+#include "ui/events/event_dispatcher.h"
 #include "ui/events/gestures/gesture_configuration.h"
 
 namespace aura {
@@ -106,5 +107,11 @@ void AuraTestBase::ParentWindow(Window* window) {
   client::ParentWindowWithContext(window, root_window(), gfx::Rect());
 }
 
+bool AuraTestBase::DispatchEventUsingWindowDispatcher(ui::Event* event) {
+  ui::EventDispatchDetails details = dispatcher()->OnEventFromSource(event);
+  CHECK(!details.dispatcher_destroyed);
+  return event->handled();
+}
+
 }  // namespace test
 }  // namespace aura