Remove "push" button from service worker internals UI.

content/browser/resources/service_worker/serviceworker_internals.js

 // 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.
 
 cr.define('serviceworker', function() {
   'use strict';
 
   function initialize() {
     update();
   }
@@ skipping 24 matching lines @@
         inputs[i].hasClickEvent = true;
       }
     }
   }
 
   function progressNodeFor(link) {
     return link.parentNode.querySelector('.operation-status');
   }
 
   // All commands are completed with 'onOperationComplete'.
-  var COMMANDS = ['stop', 'push', 'inspect', 'unregister', 'start'];
+  var COMMANDS = ['stop', 'inspect', 'unregister', 'start'];
   function commandHandler(command) {
     return function(event) {
       var link = event.target;
       progressNodeFor(link).style.display = 'inline';
       sendCommand(command, link.cmdArgs, (function(status) {
         progressNodeFor(link).style.display = 'none';
       }).bind(null, link));
       return false;
     };
   };
@@ skipping 201 matching lines @@
     onRunningStateChanged: onRunningStateChanged,
     onErrorReported: onErrorReported,
     onConsoleMessageReported: onConsoleMessageReported,
     onVersionStateChanged: onVersionStateChanged,
     onRegistrationStored: onRegistrationStored,
     onRegistrationDeleted: onRegistrationDeleted,
   };
 });
 
 document.addEventListener('DOMContentLoaded', serviceworker.initialize);