Reapply "Reduce size by emitting $.foo instead of Isolate.prototype.foo."

frog/tests/leg/src/NoDuplicateConstructorBodyTest.dart

Index: frog/tests/leg/src/NoDuplicateConstructorBodyTest.dart
diff --git a/frog/tests/leg/src/NoDuplicateConstructorBodyTest.dart b/frog/tests/leg/src/NoDuplicateConstructorBodyTest.dart
index ed811e2866318400ec1732d0896d72b472da7069..ba8ce319950e9a9314a7ed240b940e5c16b140fd 100644
--- a/frog/tests/leg/src/NoDuplicateConstructorBodyTest.dart
+++ b/frog/tests/leg/src/NoDuplicateConstructorBodyTest.dart
@@ -16,7 +16,7 @@ main() {
 
 main() {
   String generated = compileAll(CODE);
-  RegExp regexp = new RegExp('Isolate.prototype.A.prototype.A');
+  RegExp regexp = new RegExp(@'\$.A.prototype.A');
   Iterator<Match> matches = regexp.allMatches(generated).iterator();
   checkNumberOfMatches(matches, 1);
 }