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

components/sessions/base_session_service_test_helper.h

-// Copyright 2014 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 COMPONENTS_SESSIONS_BASE_SESSION_SERVICE_TEST_HELPER_H_
-#define COMPONENTS_SESSIONS_BASE_SESSION_SERVICE_TEST_HELPER_H_
-
-#include "base/basictypes.h"
-#include "base/callback.h"
-#include "base/memory/scoped_vector.h"
-#include "base/task/cancelable_task_tracker.h"
-
-namespace sessions {
-class SessionCommand;
-class BaseSessionService;
-
-class BaseSessionServiceTestHelper {
- public:
-  explicit BaseSessionServiceTestHelper(
-      BaseSessionService* base_session_service_);
-  ~BaseSessionServiceTestHelper();
-
-  // This posts the task to the SequencedWorkerPool, or run immediately
-  // if the SequencedWorkerPool has been shutdown.
-  void RunTaskOnBackendThread(const tracked_objects::Location& from_here,
-                              const base::Closure& task);
-
-  // Returns true if any commands got processed yet - saved or queued.
-  bool ProcessedAnyCommands();
-
-  // Read the last session commands directly from file.
-  bool ReadLastSessionCommands(ScopedVector<SessionCommand>* commands);
-
- private:
-  BaseSessionService* base_session_service_;
-
-  DISALLOW_COPY_AND_ASSIGN(BaseSessionServiceTestHelper);
-};
-
-}  // namespace sessions
-
-#endif  // COMPONENTS_SESSIONS_BASE_SESSION_SERVICE_TEST_HELPER_H_