Add declaration for DictionaryValue in devtools_http_handler.h

components/devtools_http_handler/devtools_http_handler.h

 // Copyright (c) 2012 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 COMPONENTS_DEVTOOLS_HTTP_HANDLER_DEVTOOLS_HTTP_HANDLER_H_
 #define COMPONENTS_DEVTOOLS_HTTP_HANDLER_DEVTOOLS_HTTP_HANDLER_H_
 
 #include <map>
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "components/devtools_discovery/devtools_target_descriptor.h"
 #include "net/http/http_status_code.h"
 
 class GURL;
 
 namespace base {
+class DictionaryValue;
 class Thread;
 class Value;
 }
 
 namespace net {
 class IPEndPoint;
 class HttpServerRequestInfo;
 class ServerSocket;
 }
 
@@ skipping 110 matching lines @@
       std::map<std::string, devtools_discovery::DevToolsTargetDescriptor*>;
   DescriptorMap descriptor_map_;
   base::WeakPtrFactory<DevToolsHttpHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsHttpHandler);
 };
 
 }  // namespace devtools_http_handler
 
 #endif  // COMPONENTS_DEVTOOLS_HTTP_HANDLER_DEVTOOLS_HTTP_HANDLER_H_