Updating Angular version

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

 library angular.template_cache_generator;
 
 import 'dart:io';
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/src/generated/ast.dart';
-import 'source_crawler_impl.dart';
+import 'package:angular/tools/source_crawler_impl.dart';
 
 const String PACKAGE_PREFIX = 'package:';
 const String DART_PACKAGE_PREFIX = 'dart:';
 
 String fileHeader(String library) => '''// GENERATED, DO NOT EDIT!
 library ${library};
 
 import 'package:angular/angular.dart';
 
 primeTemplateCache(TemplateCache tc) {
@@ skipping 173 matching lines @@
     return key;
   }
 
   StringLiteral assertString(Expression key) {
     if (key is! StringLiteral) {
         throw 'must be a string literal: ${key.runtimeType}';
     }
     return key;
   }
 }