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

ppapi/proxy/ppp_messaging_proxy_test.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 <cstring>
 
 #include "base/synchronization/waitable_event.h"
 #include "ppapi/c/pp_var.h"
 #include "ppapi/c/ppb_var.h"
 #include "ppapi/c/ppp_messaging.h"
 #include "ppapi/proxy/ppapi_proxy_test.h"
 #include "ppapi/shared_impl/var.h"
 
-using ::ppapi::StringVar;
-
-namespace pp {
+namespace ppapi {
 namespace proxy {
 
 namespace {
 
 // This is a poor man's mock of PPP_Messaging using global variables. Eventually
 // we should generalize making PPAPI interface mocks by using IDL or macro/
 // template magic.
 PP_Instance received_instance;
 PP_Var received_var;
 base::WaitableEvent handle_message_called(false, false);
@@ skipping 106 matching lines @@
   scoped_refptr<StringVar> received_string(StringVar::FromPPVar(received_var));
   ASSERT_TRUE(received_string.get());
   EXPECT_EQ(kTestString, received_string->value());
   // Now release the var, and the string should go away (because the ref
   // count should be one).
   plugin().var_tracker().ReleaseVar(received_var);
   EXPECT_FALSE(StringVar::FromPPVar(received_var).get());
 }
 
 }  // namespace proxy
-}  // namespace pp
+}  // namespace ppapi