chromecast: Cleanup class/struct fwd declarations

chromecast/net/connectivity_checker.h

 // Copyright 2015 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 CHROMECAST_NET_CONNECTIVITY_CHECKER_H_
 #define CHROMECAST_NET_CONNECTIVITY_CHECKER_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list_threadsafe.h"
 
-class GURL;
-
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace chromecast {
 
 // Checks if internet connectivity is available.
 class ConnectivityChecker
     : public base::RefCountedThreadSafe<ConnectivityChecker> {
  public:
@@ skipping 35 matching lines @@
 
   const scoped_refptr<base::ObserverListThreadSafe<ConnectivityObserver>>
       connectivity_observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(ConnectivityChecker);
 };
 
 }  // namespace chromecast
 
 #endif  // CHROMECAST_NET_CONNECTIVITY_CHECKER_H_