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

ppapi/proxy/plugin_resource_tracker.cc

Index: ppapi/proxy/plugin_resource_tracker.cc
===================================================================
--- ppapi/proxy/plugin_resource_tracker.cc	(revision 117413)
+++ ppapi/proxy/plugin_resource_tracker.cc	(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.
 
@@ -18,9 +18,17 @@
 namespace proxy {
 
 PluginResourceTracker::PluginResourceTracker() {
+#ifdef ENABLE_PEPPER_THREADING
+  // Set the global proxy lock, since the plugin-side of the proxy needs to be
+  // synchronized.
+  ppapi::ProxyLock::Set(&proxy_lock_);
+#endif
 }
 
 PluginResourceTracker::~PluginResourceTracker() {
+#ifdef ENABLE_PEPPER_THREADING
+  ppapi::ProxyLock::Reset();
+#endif
 }
 
 PP_Resource PluginResourceTracker::PluginResourceForHostResource(