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

ppapi/shared_impl/proxy_lock.cc

-// 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.
 
 #include "ppapi/shared_impl/proxy_lock.h"
 
 #include "base/synchronization/lock.h"
-#include "ppapi/shared_impl/ppapi_globals.h"
 
 namespace ppapi {
 
+base::Lock* ProxyLock::lock_ = NULL;
+
 // static
 void ProxyLock::Acquire() {
-  base::Lock* lock(PpapiGlobals::Get()->GetProxyLock());
-  if (lock)
-    lock->Acquire();
+  if (lock_)
+    lock_->Acquire();
 }
 
 // static
 void ProxyLock::Release() {
-  base::Lock* lock(PpapiGlobals::Get()->GetProxyLock());
-  if (lock)
-    lock->Release();
+  if (lock_)
+    lock_->Release();
+}
+
+// static
+void ProxyLock::Set(base::Lock* lock) {
+  lock_ = lock;
+}
+
+// static
+void ProxyLock::Reset() {
+  Set(NULL);
 }
 
 }  // namespace ppapi