Remove obviously unneeded forward declarations from headers under src/{app,base,net}.

net/tools/flip_server/epoll_server.h

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// 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.
 
 #ifndef NET_TOOLS_FLIP_SERVER_EPOLL_SERVER_H_
 #define NET_TOOLS_FLIP_SERVER_EPOLL_SERVER_H_
 #pragma once
 
 #include <fcntl.h>
 #include <sys/queue.h>
 #include <ext/hash_map>  // it is annoying that gcc does this. oh well.
@@ skipping 25 matching lines @@
 
 #include "base/basictypes.h"
 #include "base/scoped_ptr.h"
 #include <sys/epoll.h>
 
 namespace net {
 
 class EpollServer;
 class EpollAlarmCallbackInterface;
 class ReadPipeCallback;
-class WatchDogToken;
 
 struct EpollEvent {
   EpollEvent(int events, bool is_epoll_wait)
       : in_events(events),
         out_ready_mask(0) {
   }
 
   int in_events;            // incoming events
   int out_ready_mask;       // the new event mask for ready list (0 means don't
                             // get on the ready list). This field is always
@@ skipping 1006 matching lines @@
  private:
   EpollServer::AlarmRegToken token_;
   EpollServer* eps_;
   bool registered_;
 };
 
 }  // namespace net
 
 #endif  // NET_TOOLS_FLIP_SERVER_EPOLL_SERVER_H_