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

ppapi/proxy/ppp_graphics_3d_proxy.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/ppp_graphics_3d_proxy.h"
 
 #include "ppapi/c/dev/ppp_graphics_3d_dev.h"
 #include "ppapi/proxy/host_dispatcher.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
 #include "ppapi/proxy/ppapi_messages.h"
 
-namespace pp {
+namespace ppapi {
 namespace proxy {
 
 namespace {
 
 void ContextLost(PP_Instance instance) {
   HostDispatcher::GetForInstance(instance)->Send(
       new PpapiMsg_PPPGraphics3D_ContextLost(INTERFACE_ID_PPP_GRAPHICS_3D_DEV,
                                              instance));
 }
 
@@ skipping 37 matching lines @@
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 void PPP_Graphics3D_Proxy::OnMsgContextLost(PP_Instance instance) {
   if (ppp_graphics_3d_target())
     ppp_graphics_3d_target()->Graphics3DContextLost(instance);
 }
 
 }  // namespace proxy
-}  // namespace pp
+}  // namespace ppapi