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

ppapi/proxy/ppb_graphics_3d_proxy.cc

Index: ppapi/proxy/ppb_graphics_3d_proxy.cc
diff --git a/ppapi/proxy/ppb_graphics_3d_proxy.cc b/ppapi/proxy/ppb_graphics_3d_proxy.cc
index d9af6493d93721f1a329852add57bf57c6e8911c..dfdc704a7223a68354105deb66dfd97abce46c33 100644
--- a/ppapi/proxy/ppb_graphics_3d_proxy.cc
+++ b/ppapi/proxy/ppb_graphics_3d_proxy.cc
@@ -13,14 +13,12 @@
 #include "ppapi/thunk/resource_creation_api.h"
 #include "ppapi/thunk/thunk.h"
 
-using ppapi::HostResource;
-using ppapi::Resource;
 using ppapi::thunk::EnterFunctionNoLock;
 using ppapi::thunk::EnterResourceNoLock;
 using ppapi::thunk::PPB_Graphics3D_API;
 using ppapi::thunk::ResourceCreationAPI;
 
-namespace pp {
+namespace ppapi {
 namespace proxy {
 
 namespace {
@@ -410,7 +408,7 @@ PPB_Graphics3D_Proxy::~PPB_Graphics3D_Proxy() {
 // static
 const InterfaceProxy::Info* PPB_Graphics3D_Proxy::GetInfo() {
   static const Info info = {
-    ::ppapi::thunk::GetPPB_Graphics3D_Thunk(),
+    thunk::GetPPB_Graphics3D_Thunk(),
     PPB_GRAPHICS_3D_DEV_INTERFACE,
     INTERFACE_ID_PPB_GRAPHICS_3D,
     false,
@@ -611,5 +609,5 @@ void PPB_Graphics3D_Proxy::SendSwapBuffersACKToPlugin(
 }
 
 }  // namespace proxy
-}  // namespace pp
+}  // namespace ppapi