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

ui/aura/test/test_window_delegate.cc

 // 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.
 
 #include "ui/aura/test/test_window_delegate.h"
 
 #include "base/stringprintf.h"
 #include "ui/aura/window.h"
 #include "ui/base/events/event.h"
 #include "ui/base/hit_test.h"
@@ skipping 141 matching lines @@
     case ui::ET_KEY_PRESSED:
       key_press_count_++;
       break;
     case ui::ET_KEY_RELEASED:
       key_release_count_++;
     default:
       break;
   }
 }
 
-ui::EventResult EventCountDelegate::OnMouseEvent(ui::MouseEvent* event) {
+void EventCountDelegate::OnMouseEvent(ui::MouseEvent* event) {
   switch (event->type()) {
     case ui::ET_MOUSE_MOVED:
       mouse_move_count_++;
       break;
     case ui::ET_MOUSE_ENTERED:
       mouse_enter_count_++;
       break;
     case ui::ET_MOUSE_EXITED:
       mouse_leave_count_++;
       break;
     case ui::ET_MOUSE_PRESSED:
       mouse_press_count_++;
       break;
     case ui::ET_MOUSE_RELEASED:
       mouse_release_count_++;
       break;
     default:
       break;
   }
-  return ui::ER_UNHANDLED;
 }
 
 std::string EventCountDelegate::GetMouseMotionCountsAndReset() {
   std::string result = StringPrintf("%d %d %d",
                                     mouse_enter_count_,
                                     mouse_move_count_,
                                     mouse_leave_count_);
   mouse_enter_count_ = 0;
   mouse_move_count_ = 0;
   mouse_leave_count_ = 0;
@@ skipping 14 matching lines @@
   std::string result = StringPrintf("%d %d",
                                     key_press_count_,
                                     key_release_count_);
   key_press_count_ = 0;
   key_release_count_ = 0;
   return result;
 }
 
 }  // namespace test
 }  // namespace aura