Refactor the implementation of the webNavigation extension API.

chrome/test/data/extensions/api_test/webnavigation/srcdoc/test_srcdoc.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.
 
 onload = function() {
   var getURL = chrome.extension.getURL;
   chrome.tabs.create({"url": "about:blank"}, function(tab) {
     var tabId = tab.id;
 
     chrome.test.runTests([
       // Navigates to a.html which includes an iframe with a srcdoc attribute.
       function srcdoc() {
         expect([
           { label: "a-onBeforeNavigate",
             event: "onBeforeNavigate",
             details: { frameId: 0,
                        parentFrameId: -1,
-                       processId: 0,
+                       processId: -1,
                        tabId: 0,
                        timeStamp: 0,
                        url: getURL('a.html') }},
           { label: "a-onCommitted",
             event: "onCommitted",
             details: { frameId: 0,
                        processId: 0,
                        tabId: 0,
                        timeStamp: 0,
                        transitionQualifiers: [],
@@ skipping 10 matching lines @@
             event: "onCompleted",
             details: { frameId: 0,
                        processId: 0,
                        tabId: 0,
                        timeStamp: 0,
                        url: getURL('a.html') }},
           { label: "b-onBeforeNavigate",
             event: "onBeforeNavigate",
             details: { frameId: 1,
                        parentFrameId: 0,
-                       processId: 0,
+                       processId: -1,
                        tabId: 0,
                        timeStamp: 0,
                        url: 'about:srcdoc' }},
           { label: "b-onCommitted",
             event: "onCommitted",
             details: { frameId: 1,
                        processId: 0,
                        tabId: 0,
                        timeStamp: 0,
                        transitionQualifiers: [],
@@ skipping 14 matching lines @@
                        timeStamp: 0,
                        url: 'about:srcdoc' }}],
           [ navigationOrder("a-"),
             navigationOrder("b-"),
             isIFrameOf("b-", "a-")]);
         chrome.tabs.update(tabId, { url: getURL('a.html') });
       },
     ]);
   });
 };