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

ppapi/proxy/plugin_var_tracker_unittest.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 "ipc/ipc_test_sink.h"
 #include "ppapi/proxy/plugin_var_tracker.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/ppapi_proxy_test.h"
 
-namespace pp {
+namespace ppapi {
 namespace proxy {
 
 namespace {
 
 PP_Var MakeObject(int32 object_id) {
   PP_Var ret;
   ret.type = PP_VARTYPE_OBJECT;
   ret.value.as_id = object_id;
   return ret;
 }
@@ skipping 133 matching lines @@
   // Now release those tracked items, the reference should be freed.
   var_tracker().StopTrackingObjectWithNoReference(plugin_var);
   EXPECT_EQ(1,
             var_tracker().GetTrackedWithNoReferenceCountForObject(plugin_var));
   var_tracker().StopTrackingObjectWithNoReference(plugin_var);
   EXPECT_EQ(-1,
             var_tracker().GetTrackedWithNoReferenceCountForObject(plugin_var));
 }
 
 }  // namespace proxy
-}  // namespace pp
+}  // namespace ppapi