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

ppapi/shared_impl/proxy_lock.h

Index: ppapi/shared_impl/proxy_lock.h
===================================================================
--- ppapi/shared_impl/proxy_lock.h	(revision 117413)
+++ ppapi/shared_impl/proxy_lock.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.
 
@@ -34,6 +34,14 @@
   // Relinquish the proxy lock. If the lock has not been set, this does nothing.
   static void Release();
 
+  // Set the lock that ProxyLock will use. The caller is responsible for
+  // ensuring that the lock stays valid so long as the ProxyLock may be in use.
+  static void Set(base::Lock* lock);
+  // Set the lock to NULL.
+  static void Reset();
+ private:
+  static base::Lock* lock_;
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(ProxyLock);
 };