Remove thread restriction of fileapi::FileSystemContext::ResolveURL.

webkit/browser/fileapi/file_system_context.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 WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_CONTEXT_H_
 #define WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_CONTEXT_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 190 matching lines @@
   // If |create| is true this may actually set up a filesystem instance
   // (e.g. by creating the root directory or initializing the database
   // entry etc).
   void OpenFileSystem(
       const GURL& origin_url,
       FileSystemType type,
       OpenFileSystemMode mode,
       const OpenFileSystemCallback& callback);
 
   // Opens the filesystem for the given |url| as read-only, and then checks the
-  // existence of the file entry referred by the URL. This should be called on
-  // the IO thread.
+  // existence of the file entry referred by the URL. Can be called from any
+  // thread with a message loop. |callback| is invoked on the caller thread.
   void ResolveURL(
       const FileSystemURL& url,
       const ResolveURLCallback& callback);
 
   // Attempts to mount the filesystem needed to satisfy |url_request| made
   // from |storage_domain|. If an appropriate file system is not found,
   // callback will return an error.
   void AttemptAutoMountForURLRequest(const net::URLRequest* url_request,
                                      const std::string& storage_domain,
                                      const StatusCallback& callback);
@@ skipping 178 matching lines @@
 
 struct DefaultContextDeleter {
   static void Destruct(const FileSystemContext* context) {
     context->DeleteOnCorrectThread();
   }
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_CONTEXT_H_