Move scanner into pkg/front_end/lib/src/scanner.

pkg/analyzer/test/generated/non_hint_code_test.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.test.generated.non_hint_code_test;
 
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/src/error/codes.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
@@ skipping 374 matching lines @@
 
   void test_importDeferredLibraryWithLoadFunction() {
     resolveWithErrors(<String>[
       r'''
 library lib1;
 f() {}''',
       r'''
 library root;
 import 'lib1.dart' deferred as lib1;
 main() { lib1.f(); }'''
-    ], ErrorCode.EMPTY_LIST);
+    ], const <ErrorCode>[]);
   }
 
   void test_issue20904BuggyTypePromotionAtIfJoin_1() {
     // https://code.google.com/p/dart/issues/detail?id=20904
     Source source = addSource(r'''
 f(var message, var dynamic_) {
   if (message is Function) {
     message = dynamic_;
   }
   int s = message;
@@ skipping 934 matching lines @@
 
   void test_import_valid_outside_lib() {
     cacheSource("/myproj/pubspec.yaml", "");
     cacheSource("/myproj/web/other.dart", "");
     Source source =
         addNamedSource("/myproj/lib2/test.dart", "import '../web/other.dart';");
     computeLibrarySourceErrors(source);
     assertNoErrors(source);
   }
 }