Fix @visibleForTemplate tests on Windows.

TBR

[email protected]

Change-Id: I97ac89b7f3207a60fb2512a2a0af5aba231a7a35
Reviewed-on: https://dart-review.googlesource.com/69244
Reviewed-by: Konstantin Shcheglov <[email protected]>
Reviewed-by: Brian Wilkerson <[email protected]>
Commit-Queue: Konstantin Shcheglov <[email protected]>

Author: scheglov

pkg/analyzer/test/generated/hint_code_test.dart

@@ -2295,7 +2295,7 @@ class A {
 }
 ''');
     Source source2 = addNamedSource('/lib1.template.dart', r'''
-import '../lib1.dart';
+import 'lib1.dart';
 
 class B {
   void b() => new A().a();
@@ -2406,7 +2406,7 @@ class A {
 }
 ''');
     Source source2 = addNamedSource('/lib1.template.dart', r'''
-import '../lib1.dart';
+import 'lib1.dart';
 
 void main() {
   new A().a();