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

extensions/browser/app_window/app_window.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 EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_H_
 #define EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_H_
 
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
-#include "components/sessions/session_id.h"
+#include "components/sessions/core/session_id.h"
 #include "components/web_modal/web_contents_modal_dialog_manager_delegate.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "extensions/browser/extension_function_dispatcher.h"
 #include "extensions/browser/extension_icon_image.h"
 #include "extensions/browser/extension_registry_observer.h"
 #include "ui/base/ui_base_types.h"  // WindowShowState
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/image/image.h"
 
@@ skipping 538 matching lines @@
   base::Closure on_first_commit_callback_;
 
   base::WeakPtrFactory<AppWindow> image_loader_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AppWindow);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_H_