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

ui/aura/test/test_window_delegate.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_WINDOW_DELEGATE_H_
 #define UI_AURA_TEST_TEST_WINDOW_DELEGATE_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 93 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(MaskedWindowDelegate);
 };
 
 // Keeps track of mouse/key events.
 class EventCountDelegate : public TestWindowDelegate {
  public:
   EventCountDelegate();
 
   // Overridden from TestWindowDelegate:
   virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
-  virtual ui::EventResult OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
+  virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
 
   // Returns the counts of mouse motion events in the
   // form of "<enter> <move> <leave>".
   std::string GetMouseMotionCountsAndReset();
 
   // Returns the counts of mouse button events in the
   // form of "<press> <release>".
   std::string GetMouseButtonCountsAndReset();
 
   // Returns the counts of key events in the form of
   // "<press> <release>".
   std::string GetKeyCountsAndReset();
 
  private:
   int mouse_enter_count_;
   int mouse_move_count_;
   int mouse_leave_count_;
   int mouse_press_count_;
   int mouse_release_count_;
   int key_press_count_;
   int key_release_count_;
 
   DISALLOW_COPY_AND_ASSIGN(EventCountDelegate);
 };
 
 }  // namespace test
 }  // namespace aura
 
 #endif  // UI_AURA_TEST_TEST_WINDOW_DELEGATE_H_