Introduce TabRestoreServiceClient and //chrome implementation.

chrome/browser/sessions/session_service.cc

 // 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.
 
 #include "chrome/browser/sessions/session_service.h"
 
 #include <algorithm>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 479 matching lines @@
                                        const SessionID& tab_id,
                                        base::TimeTicks last_active_time) {
   if (!ShouldTrackChangesToWindow(window_id))
     return;
 
   ScheduleCommand(
       sessions::CreateLastActiveTimeCommand(tab_id, last_active_time).Pass());
 }
 
 base::CancelableTaskTracker::TaskId SessionService::GetLastSession(
-    const SessionCallback& callback,
+    const sessions::GotLastSessionCallback& callback,
     base::CancelableTaskTracker* tracker) {
   // OnGotSessionCommands maps the SessionCommands to browser state, then run
   // the callback.
   return base_session_service_->ScheduleGetLastSessionCommands(
       base::Bind(&SessionService::OnGotSessionCommands,
                  weak_factory_.GetWeakPtr(),
                  callback),
       tracker);
 }
 
@@ skipping 177 matching lines @@
   }
 }
 
 void SessionService::OnBrowserSetLastActive(Browser* browser) {
   if (ShouldTrackBrowser(browser))
     ScheduleCommand(sessions::CreateSetActiveWindowCommand(
         browser->session_id()).Pass());
 }
 
 void SessionService::OnGotSessionCommands(
-    const SessionCallback& callback,
+    const sessions::GotLastSessionCallback& callback,
     ScopedVector<sessions::SessionCommand> commands) {
   ScopedVector<sessions::SessionWindow> valid_windows;
   SessionID::id_type active_window_id = 0;
 
   sessions::RestoreSessionFromCommands(
       commands, &valid_windows.get(), &active_window_id);
   RemoveUnusedRestoreWindows(&valid_windows.get());
 
   callback.Run(valid_windows.Pass(), active_window_id);
 }
@@ skipping 397 matching lines @@
   for (chrome::BrowserIterator it; !it.done(); it.Next()) {
     if ((*it)->profile() == profile())
       return;
   }
   DeleteSessionOnlyData(profile());
 }
 
 sessions::BaseSessionService* SessionService::GetBaseSessionServiceForTest() {
   return base_session_service_.get();
 }