[appSwitcher] check for chrome on $scope

src/ui/public/chrome/appSwitcher/appSwitcher.js

@@ -1,4 +1,5 @@
 var parse = require('url').parse;
+var bindKey = require('lodash').bindKey;
 
 require('../appSwitcher/appSwitcher.less');
 
@@ -9,7 +10,15 @@ require('ui/modules')
     restrict: 'E',
     template: require('./appSwitcher.html'),
     controllerAs: 'switcher',
-    controller: function () {
+    controller: function ($scope, $window) {
+
+      // since we render this in an isolate scope we can't "require: ^chrome", but
+      // rather than remove all helpfull checks we can just check here.
+      if (!$scope.chrome || !$scope.chrome.getNavLinks) {
+        throw new TypeError('appSwitcher directive requires the "chrome" config-object');
+      }
+
+      this.getNavLinks = bindKey($scope.chrome, 'getNavLinks');
 
       // links don't cause full-navigation events in certain scenarios
       // so we force them when needed