refactor($rootScope): remove unused dependency

Removed unused dependency

Closes #13102

Author: lgalfaso

src/ng/rootScope.js

@@ -94,8 +94,8 @@ function $RootScopeProvider() {
     return ChildScope;
   }
 
-  this.$get = ['$injector', '$exceptionHandler', '$parse', '$browser',
-      function($injector, $exceptionHandler, $parse, $browser) {
+  this.$get = ['$exceptionHandler', '$parse', '$browser',
+      function($exceptionHandler, $parse, $browser) {
 
     function destroyChildScope($event) {
         $event.currentScope.$$destroyed = true;