Makes pinned tab restore on startup if you haven't enabled session

chrome/browser/tab_contents/tab_contents.h

 // Copyright (c) 2010 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_TAB_CONTENTS_TAB_CONTENTS_H_
 #define CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 
 #include "build/build_config.h"
 
 #include <deque>
@@ skipping 168 matching lines @@
   }
 
   // Sets the extension denoting this as an app. If |extension| is non-null this
   // tab becomes an app-tab. TabContents does not listen for unload events for
   // the extension. It's up to consumers of TabContents to do that.
   //
   // NOTE: this should only be manipulated before the tab is added to a browser.
   // TODO(sky): resolve if this is the right way to identify an app tab. If it
   // is, than this should be passed in the constructor.
   void SetAppExtension(Extension* extension);
+
+  // Convenience for setting the app extension by id. This does nothing if
+  // |app_extension_id| is empty, or an extension can't be found given the
+  // specified id.
+  void SetAppExtensionById(const std::string& app_extension_id);
+
   Extension* app_extension() const { return app_extension_; }
   bool is_app() const { return app_extension_ != NULL; }
 
 #ifdef UNIT_TEST
   // Expose the render manager for testing.
   RenderViewHostManager* render_manager() { return &render_manager_; }
 #endif
 
   // Tab navigation state ------------------------------------------------------
 
@@ skipping 998 matching lines @@
 
   // Information about the language the page is in and has been translated to.
   LanguageState language_state_;
 
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(TabContents);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_