Updating Angular version

third_party/pkg/angular/lib/tools/source_metadata_extractor.dart

 library angular.source_metadata_extractor ;
 
 import 'package:analyzer/src/generated/ast.dart';
 
-import 'source_crawler.dart';
-import '../utils.dart';
-import 'common.dart';
+import 'package:angular/tools/source_crawler.dart';
+import 'package:angular/tools/common.dart';
+import 'package:angular/utils.dart';
 
 const String _COMPONENT = '-component';
 const String _DIRECTIVE = '-directive';
 String _ATTR_DIRECTIVE = '-attr' + _DIRECTIVE;
 RegExp _ATTR_SELECTOR_REGEXP = new RegExp(r'\[([^\]]+)\]');
 const List<String> _specs = const ['=>!', '=>', '<=>', '@', '&'];
 const Map<String, String> _attrAnnotationsToSpec = const {
   'NgAttr': '@',
   'NgOneWay': '=>',
   'NgOneWayOneTime': '=>!',
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   }
   return res;
 }
 
 StringLiteral assertString(Expression key) {
   if (key is! StringLiteral) {
     throw 'must be a string literal: ${key.runtimeType}';
   }
   return key;
 }