Don't attempt to unload the same extension twice if multiple ExtensionHost instances existed for th…

chrome/browser/extensions/extension_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 
 #include <list>
 #include <map>
 #include <set>
@@ skipping 791 matching lines @@
 
   // Set to true if this is the first time this ExtensionService has run.
   // Used for specially handling external extensions that are installed the
   // first time.
   bool is_first_run_;
 
   // A set of the extension ids currently being reloaded.  We use this to
   // avoid showing a "new install" notice for an extension reinstall.
   std::set<std::string> extensions_being_reloaded_;
 
+  // A set of the extension ids currently being terminated. We use this to
+  // avoid trying to unload the same extension twice.
+  std::set<std::string> extensions_being_terminated_;
+
   scoped_ptr<ExtensionErrorUI> extension_error_ui_;
   // Sequenced task runner for extension related file operations.
   scoped_refptr<base::SequencedTaskRunner> file_task_runner_;
 
 #if defined(ENABLE_EXTENSIONS)
   scoped_ptr<extensions::ExtensionActionStorageManager>
       extension_action_storage_manager_;
 #endif
   scoped_ptr<extensions::ManagementPolicy::Provider>
       shared_module_policy_provider_;
@@ skipping 24 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            GreylistedExtensionDisabled);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            GreylistDontEnableManuallyDisabled);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            GreylistUnknownDontChange);
   DISALLOW_COPY_AND_ASSIGN(ExtensionService);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_