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

chrome/browser/sync/glue/session_sync_test_helper.h

 // Copyright 2013 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 CHROME_BROWSER_SYNC_GLUE_SESSION_SYNC_TEST_HELPER_H_
 #define CHROME_BROWSER_SYNC_GLUE_SESSION_SYNC_TEST_HELPER_H_
 
 #include <string>
 #include <vector>
 
-#include "components/sessions/session_id.h"
+#include "components/sessions/core/session_id.h"
 
 namespace sync_driver {
 struct SyncedSession;
 }
 
 namespace sync_pb {
 class SessionSpecifics;
 }
 
 namespace browser_sync {
@@ skipping 27 matching lines @@
   void Reset();
 
  private:
   int max_tab_node_id_;
   DISALLOW_COPY_AND_ASSIGN(SessionSyncTestHelper);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_SESSION_SYNC_TEST_HELPER_H_