Fix Hangouts link for apps v2.

remoting/webapp/crd/js/butter_bar.js

 // Copyright 2013 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.
 
 /**
  * @fileoverview
  * ButterBar class that is used to show the butter bar with various
  * notifications.
  */
 
@@ skipping 77 matching lines @@
     }
   }
 
   if (showSurvey) {
     this.show_(/*i18n-content*/'SURVEY_INVITATION',
                ['<a href="http://goo.gl/njH2q" target="_blank">', '</a>'],
                remoting.ButterBar.kSurveyStorageKey_);
   } else if (showHangouts) {
     this.show_(/*i18n-content*/'HANGOUTS_INVITATION',
                ['<a id="hangouts-accept" ' +
-                'href="https://plus.google.com/hangouts/_?gid=818572447316">',
+                'href="https://plus.google.com/hangouts/_?gid=818572447316" ' +
+                'target="_blank">',
                 '</a>'],
                remoting.ButterBar.kHangoutsStorageKey_);
   }
 };
 
 /** @const @private */
 remoting.ButterBar.kId_ = 'butter-bar';
 
 /** @const @private */
 remoting.ButterBar.kMessageId_ = 'butter-bar-message';
@@ skipping 18 matching lines @@
   var value = {};
   value[this.storageKey_] = {
     optIn: accepted,
     date: new Date(),
     version: chrome.runtime.getManifest().version
   };
   chrome.storage.sync.set(value);
 
   document.getElementById(remoting.ButterBar.kId_).hidden = true;
 };