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

chrome/browser/tab_contents/tab_contents.cc

 // 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.
 
 #include "chrome/browser/tab_contents/tab_contents.h"
 
 #include "app/gfx/text_elider.h"
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "base/auto_reset.h"
@@ skipping 464 matching lines @@
 void TabContents::SetAppExtension(Extension* extension) {
   DCHECK(!extension || extension->IsApp());
   app_extension_ = extension;
 
   NotificationService::current()->Notify(
       NotificationType::TAB_CONTENTS_APPLICATION_EXTENSION_CHANGED,
       Source<TabContents>(this),
       NotificationService::NoDetails());
 }
 
+void TabContents::SetAppExtensionById(const std::string& app_extension_id) {
+  if (app_extension_id.empty())
+    return;
+
+  ExtensionsService* extension_service = profile()->GetExtensionsService();
+  if (extension_service && extension_service->is_ready()) {
+    Extension* extension =
+        extension_service->GetExtensionById(app_extension_id, false);
+    if (extension)
+      SetAppExtension(extension);
+  }
+}
+
 const GURL& TabContents::GetURL() const {
   // We may not have a navigation entry yet
   NavigationEntry* entry = controller_.GetActiveEntry();
   return entry ? entry->virtual_url() : GURL::EmptyGURL();
 }
 
 const string16& TabContents::GetTitle() const {
   // Transient entries take precedence. They are used for interstitial pages
   // that are shown on top of existing pages.
   NavigationEntry* entry = controller_.GetTransientEntry();
@@ skipping 2377 matching lines @@
 }
 
 void TabContents::set_encoding(const std::string& encoding) {
   encoding_ = CharacterEncoding::GetCanonicalEncodingNameByAliasName(encoding);
 }
 
 void TabContents::SetAppIcon(const SkBitmap& app_icon) {
   app_icon_ = app_icon;
   NotifyNavigationStateChanged(INVALIDATE_TITLE);
 }