[refactor] Split up SourceTracker into SourceTracker + EventsTracker.

chrome/browser/resources/net_internals/main.js

 // 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.
 
 /**
  * Dictionary of constants (Initialized soon after loading by data from browser,
  * updated on load log).
  */
 var LogEventType = null;
 var LogEventPhase = null;
@@ skipping 150 matching lines @@
      * HTML elements that send messages to the browser.  Cannot be undone
      * without reloading the page.  Must be called before passing loaded data
      * to the individual views.
      *
      * @param {String} opt_fileName The name of the log file that has been
      *     loaded, if we're loading a log file.
      */
     onLoadLog: function(opt_fileName) {
       isViewingLoadedLog = true;
 
-      g_browser.sourceTracker.setSecurityStripping(false);
+      SourceTracker.getInstance().setSecurityStripping(false);
       this.stopCapturing();
       if (opt_fileName != undefined) {
         // If there's a file name, a log file was loaded, so swap out the status
         // bar to indicate we're no longer capturing events.
         this.statusView_.switchToSubView('loaded').setFileName(opt_fileName);
       } else {
         // Otherwise, the "Stop Capturing" button was presumably pressed.
         this.statusView_.switchToSubView('halted');
       }
     },
@@ skipping 102 matching lines @@
 
 /**
  * Returns a string representation of |family|.
  */
 function addressFamilyToString(family) {
   var str = getKeyWithValue(AddressFamily, family);
   // All the address family start with ADDRESS_FAMILY_*.
   // Strip that prefix since it is redundant and only clutters the output.
   return str.replace(/^ADDRESS_FAMILY_/, '');
 }