Cleanup: Remove unneeded forward declarations in ppapi.

ppapi/proxy/ppb_broker_proxy.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 PPAPI_PPB_BROKER_PROXY_H_
-#define PPAPI_PPB_BROKER_PROXY_H_
+#ifndef PPAPI_PROXY_PPB_BROKER_PROXY_H_
+#define PPAPI_PROXY_PPB_BROKER_PROXY_H_
 
 #include "base/sync_socket.h"
 #include "ipc/ipc_platform_file.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/cpp/completion_callback.h"
 #include "ppapi/proxy/interface_proxy.h"
 #include "ppapi/proxy/proxy_non_thread_safe_ref_count.h"
 
-struct PPB_BrokerTrusted;
-
 namespace ppapi {
 
 class HostResource;
 
 namespace proxy {
 
 class PPB_Broker_Proxy : public InterfaceProxy {
  public:
-  PPB_Broker_Proxy(Dispatcher* dispatcher);
+  explicit PPB_Broker_Proxy(Dispatcher* dispatcher);
   virtual ~PPB_Broker_Proxy();
 
   static PP_Resource CreateProxyResource(PP_Instance instance);
 
   // InterfaceProxy implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
   static const ApiID kApiID = API_ID_PPB_BROKER;
 
  private:
   // Message handlers.
   void OnMsgCreate(PP_Instance instance, ppapi::HostResource* result_resource);
   void OnMsgConnect(const ppapi::HostResource& broker);
   void OnMsgConnectComplete(const ppapi::HostResource& broker,
                             IPC::PlatformFileForTransit foreign_socket_handle,
                             int32_t result);
 
   void ConnectCompleteInHost(int32_t result,
                              const ppapi::HostResource& host_resource);
 
   pp::CompletionCallbackFactory<PPB_Broker_Proxy,
                                 ProxyNonThreadSafeRefCount> callback_factory_;
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
-#endif  // PPAPI_PPB_BROKER_PROXY_H_
+#endif  // PPAPI_PROXY_PPB_BROKER_PROXY_H_