fix(metadata_extractor): Do not try to guess the selector
fix(metadata_extractor): Do not try to guess the selector

The dynamic version of angular mandates that the selector is specified.
This commit makes the static vesion consistent with that behavior, the
selector must always be explicitely specified.

trinarytree/angular.dart,SibuStephen/angular.dart,winstonewert/angular.dart,ronlobo/angular.dart,winstonewert/angular.dart,winstonewert/angular.dart,giovannicandido/angular.dart,ronlobo/angular.dart,SibuStephen/angular.dart,ronlobo/angular.dart,hitesh97/angular.dart,SibuStephen/angular.dart,rkirov/angular.dart,rkirov/angular.dart,SibuStephen/angular.dart,hitesh97/angular.dart,ronlobo/angular.dart,rkirov/angular.dart,giovannicandido/angular.dart,trinarytree/angular.dart,trinarytree/angular.dart,giovannicandido/angular.dart,hitesh97/angular.dart,hitesh97/angular.dart,winstonewert/angular.dart,rkirov/angular.dart,trinarytree/angular.dart