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

components/sessions/core/tab_restore_service_helper.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/core/tab_restore_service_helper.h"
 
 #include <algorithm>
 #include <iterator>
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/stl_util.h"
 #include "components/sessions/core/live_tab.h"
+#include "components/sessions/core/serialized_navigation_entry.h"
+#include "components/sessions/core/session_types.h"
 #include "components/sessions/core/tab_restore_service_client.h"
 #include "components/sessions/core/tab_restore_service_delegate.h"
 #include "components/sessions/core/tab_restore_service_observer.h"
-#include "components/sessions/serialized_navigation_entry.h"
-#include "components/sessions/session_types.h"
 
 namespace sessions {
 
 // TabRestoreServiceHelper::Observer -------------------------------------------
 
 TabRestoreServiceHelper::Observer::~Observer() {}
 
 void TabRestoreServiceHelper::Observer::OnClearEntries() {}
 
 void TabRestoreServiceHelper::Observer::OnRestoreEntryById(
@@ skipping 500 matching lines @@
         tab->browser_id = new_id;
     }
   }
 }
 
 base::Time TabRestoreServiceHelper::TimeNow() const {
   return time_factory_ ? time_factory_->TimeNow() : base::Time::Now();
 }
 
 }  // namespace sessions