Redo "Steps towards making dart2js JS AST templates an indepentent library."

tests/compiler/dart2js/async_await_js_transform_test.dart

Index: tests/compiler/dart2js/async_await_js_transform_test.dart
diff --git a/tests/compiler/dart2js/async_await_js_transform_test.dart b/tests/compiler/dart2js/async_await_js_transform_test.dart
index bbcec9bd2a1df648983358bfa51800167ebbb652..10061868ebf533fbd5ea91980a9e1ceca4fb1ff5 100644
--- a/tests/compiler/dart2js/async_await_js_transform_test.dart
+++ b/tests/compiler/dart2js/async_await_js_transform_test.dart
@@ -18,9 +18,12 @@ void testTransform(String source, String expected) {
       endOfIteration: new VariableUse("endOfIteration"),
       newIterable: new VariableUse("Iterator"),
       safeVariableName: (String name) => "__$name").rewrite(fun);
-  Printer printer = new Printer(new PrintDiagnosticListener(), null);
+ 
+  JavaScriptPrintingOptions options = new JavaScriptPrintingOptions();
+  JavaScriptPrintingContext context = new SimpleJavaScriptPrintingContext();
+  Printer printer = new Printer(options, context);
   printer.visit(rewritten);
-  Expect.stringEquals(expected, printer.outBuffer.getText());
+  Expect.stringEquals(expected, context.getText());
 }
 
 main() {
@@ -943,4 +946,4 @@ function(x, y) {
   }
   return thenHelper(null, __helper, __completer, null);
 }""");
-}
+}