Revert 117399 - Make it possible to have 1 PpapiGlobals per thread. Update unit tests.

ppapi/proxy/plugin_resource_tracker.h

Index: ppapi/proxy/plugin_resource_tracker.h
===================================================================
--- ppapi/proxy/plugin_resource_tracker.h	(revision 117413)
+++ ppapi/proxy/plugin_resource_tracker.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -9,6 +9,7 @@
 #include <utility>
 
 #include "base/compiler_specific.h"
+#include "base/synchronization/lock.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_stdint.h"
@@ -44,6 +45,9 @@
   typedef std::map<HostResource, PP_Resource> HostResourceMap;
   HostResourceMap host_resource_map_;
 
+  // The global lock for the plugin side of the proxy.
+  base::Lock proxy_lock_;
+
   DISALLOW_COPY_AND_ASSIGN(PluginResourceTracker);
 };