Revert 170641 because it broke mac-debug build.

ui/base/events/event_dispatcher.h

Index: ui/base/events/event_dispatcher.h
===================================================================
--- ui/base/events/event_dispatcher.h	(revision 170644)
+++ ui/base/events/event_dispatcher.h	(working copy)
@@ -115,6 +115,16 @@
   }
 
   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.