Move all core files in //components/sessions into core/ subdir

components/sessions/core/base_session_service.cc

 // Copyright 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 "components/sessions/base_session_service.h"
+#include "components/sessions/core/base_session_service.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/threading/thread.h"
-#include "components/sessions/base_session_service_delegate.h"
-#include "components/sessions/session_backend.h"
+#include "components/sessions/core/base_session_service_delegate.h"
+#include "components/sessions/core/session_backend.h"
 
 // BaseSessionService ---------------------------------------------------------
 
 namespace sessions {
 namespace {
 
 // Helper used by ScheduleGetLastSessionCommands. It runs callback on TaskRunner
 // thread if it's not canceled.
 void RunIfNotCanceled(
     const base::CancelableTaskTracker::IsCanceledCallback& is_canceled,
@@ skipping 152 matching lines @@
     pool->PostSequencedWorkerTask(sequence_token_, from_here, task);
   } else {
     // Fall back to executing on the main thread if the sequence
     // worker pool has been requested to shutdown (around shutdown
     // time).
     task.Run();
   }
 }
 
 }  // namespace sessions