extensions: Cleanup class/struct fwd declarations

extensions/common/manifest_handlers/externally_connectable.h

 // Copyright 2014 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 EXTENSIONS_COMMON_MANIFEST_HANDLERS_EXTERNALLY_CONNECTABLE_H_
 #define EXTENSIONS_COMMON_MANIFEST_HANDLERS_EXTERNALLY_CONNECTABLE_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/install_warning.h"
 #include "extensions/common/manifest_handler.h"
 #include "extensions/common/url_pattern_set.h"
 
-class GURL;
-
 namespace base {
 class Value;
 }
 
 namespace extensions {
 
 // Error constants used when parsing the externally_connectable manifest entry.
 namespace externally_connectable_errors {
 extern const char kErrorInvalid[];
 extern const char kErrorInvalidMatchPattern[];
@@ skipping 60 matching lines @@
                             bool all_ids,
                             bool accepts_tls_channel_id);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ExternallyConnectableInfo);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_MANIFEST_HANDLERS_EXTERNALLY_CONNECTABLE_H_