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

components/sessions/core/base_session_service_delegate.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_DELEGATE_H_
-#define COMPONENTS_SESSIONS_BASE_SESSION_SERVICE_DELEGATE_H_
+#ifndef COMPONENTS_SESSIONS_CORE_BASE_SESSION_SERVICE_DELEGATE_H_
+#define COMPONENTS_SESSIONS_CORE_BASE_SESSION_SERVICE_DELEGATE_H_
 
 #include "base/memory/scoped_ptr.h"
 
 namespace base {
 class SequencedWorkerPool;
 }
 
 namespace sessions {
 
 // The BaseSessionServiceDelegate decouples the BaseSessionService from
@@ skipping 15 matching lines @@
 
   // Called when commands were saved to disc.
   virtual void OnSavedCommands() {}
 
  protected:
   virtual ~BaseSessionServiceDelegate() {}
 };
 
 }  // namespace sessions
 
-#endif  // COMPONENTS_SESSIONS_BASE_SESSION_SERVICE_DELEGATE_H_
+#endif  // COMPONENTS_SESSIONS_CORE_BASE_SESSION_SERVICE_DELEGATE_H_