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

ppapi/proxy/resource_creation_proxy.cc

Index: ppapi/proxy/resource_creation_proxy.cc
diff --git a/ppapi/proxy/resource_creation_proxy.cc b/ppapi/proxy/resource_creation_proxy.cc
index 98e8ffcb491c827f554f97a68f8145878ee2f3b7..4e2f2eb6ffbedf1d5f5afc72e80fdb68ee181e48 100644
--- a/ppapi/proxy/resource_creation_proxy.cc
+++ b/ppapi/proxy/resource_creation_proxy.cc
@@ -40,12 +40,9 @@
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/ppb_image_data_api.h"
 
-using ppapi::HostResource;
-using ppapi::InputEventData;
-using ppapi::StringVar;
 using ppapi::thunk::ResourceCreationAPI;
 
-namespace pp {
+namespace ppapi {
 namespace proxy {
 
 ResourceCreationProxy::ResourceCreationProxy(Dispatcher* dispatcher)
@@ -397,7 +394,7 @@ void ResourceCreationProxy::OnMsgCreateImageData(
     int32_t handle;
     if (trusted->GetSharedMemory(resource, &handle, &byte_count) == PP_OK) {
 #if defined(OS_WIN)
-      pp::proxy::ImageHandle ih = ImageData::HandleFromInt(handle);
+      ImageHandle ih = ImageData::HandleFromInt(handle);
       *result_image_handle = dispatcher_->ShareHandleWithRemote(ih, false);
 #else
       *result_image_handle = ImageData::HandleFromInt(handle);
@@ -407,4 +404,4 @@ void ResourceCreationProxy::OnMsgCreateImageData(
 }
 
 }  // namespace proxy
-}  // namespace pp
+}  // namespace ppapi