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

ppapi/proxy/ppb_surface_3d_proxy.h

Index: ppapi/proxy/ppb_surface_3d_proxy.h
diff --git a/ppapi/proxy/ppb_surface_3d_proxy.h b/ppapi/proxy/ppb_surface_3d_proxy.h
index ae2ec8fc3a4c25f01b09f19767f6ca428860f78f..214bda1a1c7f747cf5b88d9abf2ab393f3276cbf 100644
--- a/ppapi/proxy/ppb_surface_3d_proxy.h
+++ b/ppapi/proxy/ppb_surface_3d_proxy.h
@@ -18,7 +18,7 @@
 
 struct PPB_Surface3D_Dev;
 
-namespace pp {
+namespace ppapi {
 namespace proxy {
 
 class Context3D;
@@ -89,11 +89,11 @@ class PPB_Surface3D_Proxy : public InterfaceProxy {
   void SendSwapBuffersACKToPlugin(int32_t result,
                                   const ppapi::HostResource& surface_3d);
 
-  CompletionCallbackFactory<PPB_Surface3D_Proxy,
-                            ProxyNonThreadSafeRefCount> callback_factory_;
+  pp::CompletionCallbackFactory<PPB_Surface3D_Proxy,
+                                ProxyNonThreadSafeRefCount> callback_factory_;
 };
 
 }  // namespace proxy
-}  // namespace pp
+}  // namespace ppapi
 
 #endif  // PPAPI_PPB_SURFACE_3D_PROXY_H_