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

components/sessions/core/session_command.h

 // Copyright 2006 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_SESSION_COMMAND_H_
-#define COMPONENTS_SESSIONS_SESSION_COMMAND_H_
+#ifndef COMPONENTS_SESSIONS_CORE_SESSION_COMMAND_H_
+#define COMPONENTS_SESSIONS_CORE_SESSION_COMMAND_H_
 
 #include <string>
 
 #include "base/basictypes.h"
-#include "components/sessions/sessions_export.h"
+#include "components/sessions/core/sessions_export.h"
 
 namespace base {
 class Pickle;
 }
 
 namespace sessions {
 
 // SessionCommand contains a command id and arbitrary chunk of data. The id
 // and chunk of data are specific to the service creating them.
 //
@@ skipping 43 matching lines @@
 
  private:
   const id_type id_;
   std::string contents_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionCommand);
 };
 
 }  // namespace sessions
 
-#endif  // COMPONENTS_SESSIONS_SESSION_COMMAND_H_
+#endif  // COMPONENTS_SESSIONS_CORE_SESSION_COMMAND_H_