dartfmt dart2js and unittests

pkg/compiler/lib/src/js_emitter/metadata_collector.dart

Index: pkg/compiler/lib/src/js_emitter/metadata_collector.dart
diff --git a/pkg/compiler/lib/src/js_emitter/metadata_collector.dart b/pkg/compiler/lib/src/js_emitter/metadata_collector.dart
index d91813557fac66b6c91ffc17895d03540bb0bcb4..94b014a447efa5420109f515c0f62031d7456f0a 100644
--- a/pkg/compiler/lib/src/js_emitter/metadata_collector.dart
+++ b/pkg/compiler/lib/src/js_emitter/metadata_collector.dart
@@ -247,8 +247,8 @@ class MetadataCollector implements jsAst.TokenFinalizer {
       int i = source.requiredParameterCount;
       for (ParameterElement element in source.orderedOptionalParameters) {
         if (i >= target.requiredParameterCount && i < target.parameterCount) {
-          map[element] = target.orderedOptionalParameters[
-              i - target.requiredParameterCount];
+          map[element] = target
+              .orderedOptionalParameters[i - target.requiredParameterCount];
         }
         ++i;
       }