fix(url_resolver): always replace package: in Dart, even if it came from baseUrl.

Closes #4775

modules/angular2/src/core/compiler/url_resolver.dart

@@ -1,6 +1,10 @@
 library angular2.src.services.url_resolver;
 
-import 'package:angular2/src/core/di.dart' show Injectable;
+import 'package:angular2/src/core/di.dart' show Injectable, Provider;
+
+UrlResolver createWithoutPackagePrefix() {
+  return new UrlResolver.withUrlPrefix(null);
+}
 
 @Injectable()
 class UrlResolver {
@@ -28,14 +32,15 @@ class UrlResolver {
    */
   String resolve(String baseUrl, String url) {
     Uri uri = Uri.parse(url);
-
-    if (uri.scheme == 'package') {
-      return '$_packagePrefix/${uri.path}';
+    if (!uri.isAbsolute) {
+      Uri baseUri = Uri.parse(baseUrl);
+      uri = baseUri.resolveUri(uri);
     }
 
-    if (uri.isAbsolute) return uri.toString();
-
-    Uri baseUri = Uri.parse(baseUrl);
-    return baseUri.resolveUri(uri).toString();
+    if (_packagePrefix != null && uri.scheme == 'package') {
+      return '$_packagePrefix/${uri.path}';
+    } else {
+      return uri.toString();
+    }
   }
 }

modules/angular2/src/core/compiler/url_resolver.ts

@@ -3,6 +3,11 @@ import {isPresent, isBlank, RegExpWrapper, normalizeBlank} from 'angular2/src/co
 import {BaseException, WrappedException} from 'angular2/src/core/facade/exceptions';
 import {ListWrapper} from 'angular2/src/core/facade/collection';
 
+export function createWithoutPackagePrefix(): UrlResolver {
+  return new UrlResolver();
+}
+
+
 /**
  * Used by the {@link Compiler} when resolving HTML and CSS template URLs.
  *