Convert the pp::proxy namespace to the ppapi::proxy namespace.

ppapi/thunk/ppb_instance_api.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_THUNK_INSTANCE_API_H_
 #define PPAPI_THUNK_INSTANCE_API_H_
 
 #include "ppapi/c/ppb_instance.h"
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_size.h"
@@ skipping 35 matching lines @@
 
   // Zoom.
   virtual void ZoomChanged(PP_Instance instance, double factor) = 0;
   virtual void ZoomLimitsChanged(PP_Instance instance,
                                  double minimum_factor,
                                  double maximium_factor) = 0;
 
   // QueryPolicy.
   virtual void SubscribeToPolicyUpdates(PP_Instance instance) = 0;
 
-  static const ::pp::proxy::InterfaceID interface_id =
-      ::pp::proxy::INTERFACE_ID_PPB_INSTANCE;
+  static const proxy::InterfaceID interface_id =
+      proxy::INTERFACE_ID_PPB_INSTANCE;
 };
 
 }  // namespace thunk
 }  // namespace ppapi
 
 #endif  // PPAPI_THUNK_INSTANCE_API_H_