Fix use-after-free in WebstoreInstaller

chrome/browser/extensions/webstore_standalone_installer.cc

 // Copyright (c) 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 "chrome/browser/extensions/webstore_standalone_installer.h"
 
 #include "base/values.h"
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
 #include "chrome/browser/extensions/extension_install_ui.h"
@@ skipping 236 matching lines @@
     }  // else extension is installed and enabled; no work to be done.
     CompleteInstall(install_result);
     return;
   }
 
   scoped_ptr<WebstoreInstaller::Approval> approval = CreateApproval();
 
   scoped_refptr<WebstoreInstaller> installer = new WebstoreInstaller(
       profile_,
       this,
-      &(GetWebContents()->GetController()),
+      GetWebContents(),
       id_,
       approval.Pass(),
       install_source_);
   installer->Start();
 }
 
 void WebstoreStandaloneInstaller::InstallUIAbort(bool user_initiated) {
   CompleteInstall(kUserCancelledError);
   Release();  // Balanced in ShowInstallUI.
 }
@@ skipping 53 matching lines @@
   // Balanced in InstallUIAbort or indirectly in InstallUIProceed via
   // OnExtensionInstallSuccess or OnExtensionInstallFailure.
   AddRef();
 
   install_ui_ = CreateInstallUI();
   install_ui_->ConfirmStandaloneInstall(
       this, localized_extension_for_display_.get(), &icon_, *install_prompt_);
 }
 
 }  // namespace extensions