events: Dispatch all events through EventHandler::OnEvent from the dispatcher.

ui/base/events/event_dispatcher.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_BASE_EVENTS_EVENT_DISPATCHER_H_
 #define UI_BASE_EVENTS_EVENT_DISPATCHER_H_
 
 #include "ui/base/events/event.h"
 #include "ui/base/events/event_constants.h"
 #include "ui/base/events/event_target.h"
@@ skipping 97 matching lines @@
     if (destroyed) {
       result |= ui::ER_CONSUMED;
     } else {
       current_event_ = old_event;
       set_on_destroy_ = NULL;
     }
     return result;
   }
 
   EventResult DispatchEventToSingleHandler(EventHandler* handler, Event* event);
-  EventResult DispatchEventToSingleHandler(EventHandler* handler,
-                                           KeyEvent* event);
-  EventResult DispatchEventToSingleHandler(EventHandler* handler,
-                                           MouseEvent* event);
-  EventResult DispatchEventToSingleHandler(EventHandler* handler,
-                                           ScrollEvent* event);
-  EventResult DispatchEventToSingleHandler(EventHandler* handler,
-                                           TouchEvent* event);
-  EventResult DispatchEventToSingleHandler(EventHandler* handler,
-                                           GestureEvent* event);
 
   // This is used to track whether the dispatcher has been destroyed in the
   // middle of dispatching an event.
   bool* set_on_destroy_;
 
   Event* current_event_;
 
   DISALLOW_COPY_AND_ASSIGN(EventDispatcher);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_EVENTS_EVENT_DISPATCHER_H_