Fix for crash when deleting DataSource's in IO thread.

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 110 matching lines @@
   static net::URLRequestJob* Factory(net::URLRequest* request,
                                      const std::string& scheme);
 
  private:
   friend class URLRequestChromeJob;
   friend struct DefaultSingletonTraits<ChromeURLDataManager>;
 
   ChromeURLDataManager();
   ~ChromeURLDataManager();
 
+  // Releases a data source.  Must be called on the UI thread so |source| is
+  // deleted in that thread.
+  void ReleaseDataSource(scoped_refptr<DataSource> source);
+
   // Parse a URL into the components used to resolve its request.
   static void URLToRequest(const GURL& url,
                            std::string* source,
                            std::string* path);
 
   // Translate a chrome resource URL into a local file path if there is one.
   // Returns false if there is no file handler for this URL
   static bool URLToFilePath(const GURL& url, FilePath* file_path);
 
   // Called by the job when it's starting up.
@@ skipping 34 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_