events: Update mouse-event handlers to not return EventResult.

ui/aura/test/test_event_handler.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_AURA_TEST_TEST_EVENT_HANDLER_H_
 #define UI_AURA_TEST_TEST_EVENT_HANDLER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/base/events/event_handler.h"
@@ skipping 11 matching lines @@
   int num_key_events() const { return num_key_events_; }
   int num_mouse_events() const { return num_mouse_events_; }
   int num_scroll_events() const { return num_scroll_events_; }
   int num_touch_events() const { return num_touch_events_; }
   int num_gesture_events() const { return num_gesture_events_; }
 
   void Reset();
 
   // ui::EventHandler overrides:
   virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
-  virtual ui::EventResult OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
+  virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
   virtual void OnScrollEvent(ui::ScrollEvent* event) OVERRIDE;
   virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 
  private:
   // How many events have been received of each type?
   int num_key_events_;
   int num_mouse_events_;
   int num_scroll_events_;
   int num_touch_events_;
   int num_gesture_events_;
 
   DISALLOW_COPY_AND_ASSIGN(TestEventHandler);
 };
 
 }  // namespace test
 }  // namespace aura
 
 #endif // UI_AURA_TEST_TEST_EVENT_HANDLER_H_