aura: Remove event-dispatch methods from WindowTreeHostDelegate interface.

ash/autoclick/autoclick_controller.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/autoclick/autoclick_controller.h"
 
 #include "ash/shell.h"
 #include "ash/wm/coordinate_conversion.h"
 #include "base/timer/timer.h"
 #include "ui/aura/env.h"
@@ skipping 182 matching lines @@
                              click_location,
                              click_location,
                              mouse_event_flags_ | ui::EF_LEFT_MOUSE_BUTTON,
                              ui::EF_LEFT_MOUSE_BUTTON);
   ui::MouseEvent release_event(ui::ET_MOUSE_RELEASED,
                                click_location,
                                click_location,
                                mouse_event_flags_ | ui::EF_LEFT_MOUSE_BUTTON,
                                ui::EF_LEFT_MOUSE_BUTTON);
 
-  dispatcher->AsWindowTreeHostDelegate()->OnHostMouseEvent(&press_event);
-  dispatcher->AsWindowTreeHostDelegate()->OnHostMouseEvent(&release_event);
+  ui::EventDispatchDetails details =
+      dispatcher->OnEventFromSource(&press_event);
+  if (!details.dispatcher_destroyed)
+    details = dispatcher->OnEventFromSource(&release_event);
+  if (details.dispatcher_destroyed)
+    return;
 }
 
 // static.
 AutoclickController* AutoclickController::CreateInstance() {
   return new AutoclickControllerImpl();
 }
 
 }  // namespace ash