PPAPI: Purposely leak ProxyLock, fix shutdown race

ppapi/thunk/enter.cc

 // Copyright (c) 2012 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/thunk/enter.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
@@ skipping 11 matching lines @@
   return
       PpapiGlobals::Get()->GetMainThreadMessageLoop()->BelongsToCurrentThread();
 }
 
 }  // namespace
 
 namespace thunk {
 
 namespace subtle {
 
-void AssertLockHeld() {
-  base::Lock* proxy_lock = PpapiGlobals::Get()->GetProxyLock();
-  // The lock is only valid in the plugin side of the proxy, so it only makes
-  // sense to assert there. Otherwise, silently succeed.
-  if (proxy_lock)
-    proxy_lock->AssertAcquired();
-}
-
 EnterBase::EnterBase()
     : resource_(NULL),
       retval_(PP_OK) {
 }
 
 EnterBase::EnterBase(PP_Resource resource)
     : resource_(GetResource(resource)),
       retval_(PP_OK) {
 }
 
@@ skipping 263 matching lines @@
     : EnterBase(),
       functions_(PpapiGlobals::Get()->GetResourceCreationAPI(instance)) {
   SetStateForFunctionError(instance, functions_, true);
 }
 
 EnterResourceCreationNoLock::~EnterResourceCreationNoLock() {
 }
 
 }  // namespace thunk
 }  // namespace ppapi