Convert SessionService to use new CancelableTaskTracker

chrome/browser/sessions/session_backend.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 CHROME_BROWSER_SESSIONS_SESSION_BACKEND_H_
 #define CHROME_BROWSER_SESSIONS_SESSION_BACKEND_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/sessions/base_session_service.h"
 #include "chrome/browser/sessions/session_command.h"
+#include "chrome/common/cancelable_task_tracker.h"
 
 namespace net {
 class FileStream;
 }
 
 // SessionBackend -------------------------------------------------------------
 
 // SessionBackend is the backend used by BaseSessionService. It is responsible
 // for maintaining two files:
 // . The current file, which is the file commands passed to AppendCommands
@@ skipping 34 matching lines @@
   // true the the current file is recreated.
   //
   // NOTE: this deletes SessionCommands in commands as well as the supplied
   // vector.
   void AppendCommands(std::vector<SessionCommand*>* commands,
                       bool reset_first);
 
   // Invoked from the service to read the commands that make up the last
   // session, invokes ReadLastSessionCommandsImpl to do the work.
   void ReadLastSessionCommands(
-      scoped_refptr<BaseSessionService::InternalGetCommandsRequest> request);
+      const CancelableTaskTracker::IsCanceledCallback& is_canceled,
+      const BaseSessionService::InternalGetCommandsCallback& callback);
 
   // Reads the commands from the last file.
   //
   // On success, the read commands are added to commands. It is up to the
   // caller to delete the commands.
   bool ReadLastSessionCommandsImpl(std::vector<SessionCommand*>* commands);
 
   // Deletes the file containing the commands for the last session.
   void DeleteLastSession();
 
   // Moves the current session to the last and resets the current. This is
   // called during startup and if the user launchs the app and no tabbed
   // browsers are running.
   void MoveCurrentSessionToLastSession();
 
-  // Invoked from the service to read the commands that make up the current
-  // session, invokes ReadCurrentSessionCommandsImpl to do the work.
-  void ReadCurrentSessionCommands(
-      scoped_refptr<BaseSessionService::InternalGetCommandsRequest> request);
-
   // Reads the commands from the current file.
   //
   // On success, the read commands are added to commands. It is up to the
   // caller to delete the commands.
   bool ReadCurrentSessionCommandsImpl(std::vector<SessionCommand*>* commands);
 
  private:
   friend class base::RefCountedThreadSafe<SessionBackend>;
 
   ~SessionBackend();
@@ skipping 35 matching lines @@
   // Main thread, all others on the IO thread, hence lazy initialization.
   bool inited_;
 
   // If true, the file is empty (no commands have been added to it).
   bool empty_file_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionBackend);
 };
 
 #endif  // CHROME_BROWSER_SESSIONS_SESSION_BACKEND_H_