Get more tests passing on windows

pkg/analyzer/test/generated/compile_time_error_code_test.dart

 // Copyright (c) 2014, 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.compile_time_error_code_test;
 
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/src/error/codes.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/parser.dart' show ParserErrorCode;
@@ skipping 6151 matching lines @@
     assertErrors(test, [CompileTimeErrorCode.URI_DOES_NOT_EXIST]);
   }
 
   void test_uriDoesNotExist_import_disappears_when_fixed() {
     Source source = addSource("import 'target.dart';");
     computeLibrarySourceErrors(source);
     assertErrors(source, [CompileTimeErrorCode.URI_DOES_NOT_EXIST]);
 
     // Check that the file is represented as missing.
     Source target =
-        analysisContext2.getSourcesWithFullName("/target.dart").first;
+        analysisContext2.getSourcesWithFullName(resourceProvider.convertPath("/target.dart")).first;
     expect(analysisContext2.getModificationStamp(target), -1);
 
     // Add an overlay in the same way as AnalysisServer.
     analysisContext2
       ..setContents(target, "")
       ..handleContentsChanged(target, null, "", true);
 
     // Make sure the error goes away.
     computeLibrarySourceErrors(source);
     assertErrors(source, [HintCode.UNUSED_IMPORT]);
@@ skipping 240 matching lines @@
         source, [CompileTimeErrorCode.WRONG_NUMBER_OF_PARAMETERS_FOR_OPERATOR]);
     verify([source]);
     reset();
   }
 
   void _check_wrongNumberOfParametersForOperator1(String name) {
     _check_wrongNumberOfParametersForOperator(name, "");
     _check_wrongNumberOfParametersForOperator(name, "a, b");
   }
 }