Do not set the last mouse location from synthesized event

ui/aura/test/event_generator.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/event_generator.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "ui/aura/client/screen_position_client.h"
@@ skipping 578 matching lines @@
     }
     if (pending_events_.empty()) {
       base::MessageLoopProxy::current()->PostTask(
           FROM_HERE,
           base::Bind(&EventGenerator::DispatchNextPendingEvent,
                      base::Unretained(this)));
     }
     pending_events_.push_back(pending_event);
   } else {
     ui::EventDispatchDetails details = current_root_window_->OnEventFromSource(
-        static_cast<ui::KeyEvent*>(event));
+        event);
     CHECK(!details.dispatcher_destroyed);
   }
 }
 
 void EventGenerator::DispatchNextPendingEvent() {
   DCHECK(!pending_events_.empty());
   ui::Event* event = pending_events_.front();
   DoDispatchEvent(event, false);
   pending_events_.pop_front();
   delete event;
   if (!pending_events_.empty()) {
     base::MessageLoopProxy::current()->PostTask(
         FROM_HERE,
         base::Bind(&EventGenerator::DispatchNextPendingEvent,
                    base::Unretained(this)));
   }
 }
 
 
 }  // namespace test
 }  // namespace aura