Release all DataSources before the main thread goes away.

chrome/browser/dom_ui/chrome_url_data_manager.h

 // Copyright (c) 2010 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_DOM_UI_CHROME_URL_DATA_MANAGER_H_
 #define CHROME_BROWSER_DOM_UI_CHROME_URL_DATA_MANAGER_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 97 matching lines @@
   // Add a DataSource to the collection of data sources.
   // Because we don't track users of a given path, we can't know when it's
   // safe to remove them, so the added source effectively leaks.
   // This could be improved in the future but currently the users of this
   // interface are conceptually permanent registration anyway.
   // Adding a second DataSource with the same name clobbers the first.
   // NOTE: Calling this from threads other the IO thread must be done via
   // InvokeLater.
   void AddDataSource(scoped_refptr<DataSource> source);
 
+  // Called during shutdown, before destruction of |BrowserThread|.
+  void RemoveAllDataSources();
+
   // Add/remove a path from the collection of file sources.
   // A file source acts like a file:// URL to the specified path.
   // Calling this from threads other the IO thread must be done via
   // InvokeLater.
   void AddFileSource(const std::string& source_name, const FilePath& path);
   void RemoveFileSource(const std::string& source_name);
 
   static net::URLRequestJob* Factory(net::URLRequest* request,
                                      const std::string& scheme);
 
@@ skipping 51 matching lines @@
 DISABLE_RUNNABLE_METHOD_REFCOUNT(ChromeURLDataManager);
 
 // Register our special URL handler under our special URL scheme.
 // Must be done once at startup.
 void RegisterURLRequestChromeJob();
 
 // Undoes the registration done by RegisterURLRequestChromeJob.
 void UnregisterURLRequestChromeJob();
 
 #endif  // CHROME_BROWSER_DOM_UI_CHROME_URL_DATA_MANAGER_H_