FBTF: Remove unneeded headers from base/ (part 2)

ipc/ipc_sync_message_filter.cc

 // Copyright (c) 2010 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 "ipc/ipc_sync_message_filter.h"
 
 #include "base/logging.h"
 #include "base/message_loop.h"
+#include "base/waitable_event.h"
 #include "ipc/ipc_sync_message.h"
 
 namespace IPC {
 
 SyncMessageFilter::SyncMessageFilter(base::WaitableEvent* shutdown_event)
     : channel_(NULL),
       listener_loop_(MessageLoop::current()),
       io_loop_(NULL),
       shutdown_event_(shutdown_event) {
 }
@@ skipping 98 matching lines @@
       }
       (*iter)->done_event->Signal();
       return true;
     }
   }
 
   return false;
 }
 
 }  // namespace IPC