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

ppapi/proxy/plugin_message_filter.cc

 // 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.
 
 #include "ppapi/proxy/plugin_message_filter.h"
 
 #include "ppapi/proxy/ppapi_messages.h"
 
-namespace pp {
+namespace ppapi {
 namespace proxy {
 
 PluginMessageFilter::PluginMessageFilter(
     std::set<PP_Instance>* seen_instance_ids)
     : seen_instance_ids_(seen_instance_ids),
       channel_(NULL) {
 }
 
 PluginMessageFilter::~PluginMessageFilter() {
 }
@@ skipping 31 matching lines @@
     return;
   }
 
   // This instance ID is new so we can return that it's usable and mark it as
   // used for future reference.
   seen_instance_ids_->insert(instance);
   *usable = true;
 }
 
 }  // namespace proxy
-}  // namespace pp
+}  // namespace ppapi