ext.js

  // Alias several messaging deprecated APIs to their runtime counterparts.
  var mayNeedAlias = [
    // Types
    'Port',
    // Functions
    'connect', 'sendMessage', 'connectNative', 'sendNativeMessage',
    // Events
    'onConnect', 'onConnectExternal', 'onMessage', 'onMessageExternal'
  ];
  $Array.forEach(mayNeedAlias, function(alias) {
    // Checking existence isn't enough since some functions are disabled via
    // getters that throw exceptions. Assume that any getter is such a function.
    if (chrome.runtime &&
        $Object.hasOwnProperty(chrome.runtime, alias) &&
        chrome.runtime.__lookupGetter__(alias) === undefined) {
      extension[alias] = chrome.runtime[alias];
    }
  });