Cleanup: Remove unneeded forward declarations in ppapi.

ppapi/proxy/ppb_broker_proxy.h

Index: ppapi/proxy/ppb_broker_proxy.h
===================================================================
--- ppapi/proxy/ppb_broker_proxy.h	(revision 109579)
+++ ppapi/proxy/ppb_broker_proxy.h	(working copy)
@@ -2,8 +2,8 @@
 // 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"
@@ -12,8 +12,6 @@
 #include "ppapi/proxy/interface_proxy.h"
 #include "ppapi/proxy/proxy_non_thread_safe_ref_count.h"
 
-struct PPB_BrokerTrusted;
-
 namespace ppapi {
 
 class HostResource;
@@ -22,7 +20,7 @@
 
 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);
@@ -50,4 +48,4 @@
 }  // namespace proxy
 }  // namespace ppapi
 
-#endif  // PPAPI_PPB_BROKER_PROXY_H_
+#endif  // PPAPI_PROXY_PPB_BROKER_PROXY_H_