Fix AtExitManager recursive lock acquisition.

base/at_exit.h

 // 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.
 
 #ifndef BASE_AT_EXIT_H_
 #define BASE_AT_EXIT_H_
 
 #include <stack>
 
 #include "base/base_export.h"
@@ skipping 41 matching lines @@
  protected:
   // This constructor will allow this instance of AtExitManager to be created
   // even if one already exists.  This should only be used for testing!
   // AtExitManagers are kept on a global stack, and it will be removed during
   // destruction.  This allows you to shadow another AtExitManager.
   explicit AtExitManager(bool shadow);
 
  private:
   base::Lock lock_;
   std::stack<base::Closure> stack_;
+  bool processing_callbacks_;
   AtExitManager* next_manager_;  // Stack of managers to allow shadowing.
 
   DISALLOW_COPY_AND_ASSIGN(AtExitManager);
 };
 
 #if defined(UNIT_TEST)
 class ShadowingAtExitManager : public AtExitManager {
  public:
   ShadowingAtExitManager() : AtExitManager(true) {}
 };
 #endif  // defined(UNIT_TEST)
 
 }  // namespace base
 
 #endif  // BASE_AT_EXIT_H_