Headers cleanup in chrome/common

chrome/common/ipc_sync_channel.h

 // Copyright (c) 2006-2008 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 CHROME_COMMON_IPC_SYNC_SENDER_H__
 #define CHROME_COMMON_IPC_SYNC_SENDER_H__
 
 #include <string>
 #include <deque>
+
 #include "base/basictypes.h"
 #include "base/lock.h"
 #include "base/ref_counted.h"
-#include "base/scoped_handle.h"
-#include "base/waitable_event.h"
 #include "base/waitable_event_watcher.h"
 #include "chrome/common/ipc_channel_proxy.h"
 
+namespace base {
+class WaitableEvent;
+};
+
 namespace IPC {
 
 class SyncMessage;
 class MessageReplyDeserializer;
 
 // This is similar to IPC::ChannelProxy, with the added feature of supporting
 // sending synchronous messages.
 // Note that care must be taken that the lifetime of the ipc_thread argument
 // is more than this object.  If the message loop goes away while this object
 // is running and it's used to send a message, then it will use the invalid
@@ skipping 122 matching lines @@
   // Used to signal events between the IPC and listener threads.
   base::WaitableEventWatcher send_done_watcher_;
   base::WaitableEventWatcher dispatch_watcher_;
 
   DISALLOW_EVIL_CONSTRUCTORS(SyncChannel);
 };
 
 }  // namespace IPC
 
 #endif  // CHROME_COMMON_IPC_SYNC_SENDER_H__