Cleanup: Remove unneeded forward declarations from remoting.

remoting/host/chromoting_host_context.h

 // Copyright (c) 2011 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 REMOTING_HOST_CHROMOTING_HOST_CONTEXT_H_
 #define REMOTING_HOST_CHROMOTING_HOST_CONTEXT_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/gtest_prod_util.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread.h"
 #include "remoting/jingle_glue/jingle_thread.h"
 
-class Task;
-
-namespace tracked_objects {
-class Location;
-}
-
 namespace remoting {
 
 // A class that manages threads and running context for the chromoting host
 // process.  This class is virtual only for testing purposes (see below).
 class ChromotingHostContext {
  public:
   // Create a context.
-  ChromotingHostContext(base::MessageLoopProxy* ui_message_loop);
+  explicit ChromotingHostContext(base::MessageLoopProxy* ui_message_loop);
   virtual ~ChromotingHostContext();
 
   // TODO(ajwong): Move the Start/Stop methods out of this class. Then
   // create a static factory for construction, and destruction.  We
   // should be able to remove the need for virtual functions below with that
   // design, while preserving the relative simplicity of this API.
   virtual void Start();
   virtual void Stop();
 
   virtual JingleThread* jingle_thread();
@@ skipping 21 matching lines @@
   base::Thread desktop_thread_;
 
   scoped_refptr<base::MessageLoopProxy> ui_message_loop_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromotingHostContext);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_CHROMOTING_HOST_CONTEXT_H_