Move spaces from before comments to within comments

tests/html/postmessage_structured_test.dart

Index: tests/html/postmessage_structured_test.dart
diff --git a/tests/html/postmessage_structured_test.dart b/tests/html/postmessage_structured_test.dart
index c42cfedbffca7b7d3d9f997712d2c9919319a5aa..8ceee641275866321a44f33e2cbeda9d80dbcf6b 100644
--- a/tests/html/postmessage_structured_test.dart
+++ b/tests/html/postmessage_structured_test.dart
@@ -68,7 +68,7 @@ main() {
       subscription = window.onMessage.listen(expectAsyncUntil(
         (e) {
           var data = e.data;
-          if (data is String) return;    // Messages from unit test protocol.
+          if (data is String) return; //    Messages from unit test protocol.
           completed = true;
           subscription.cancel();
           expect(data, isMap);
@@ -98,7 +98,7 @@ main() {
       subscription = window.onMessage.listen(expectAsyncUntil(
         (e) {
           var data = e.data;
-          if (data is String) return;    // Messages from unit test protocol.
+          if (data is String) return; //    Messages from unit test protocol.
           if (data['recipient'] != 'DART') return;  // Hearing the sent message.
           completed = true;
           subscription.cancel();
@@ -154,7 +154,7 @@ main() {
       subscription = window.on['stuff'].listen(expectAsyncUntil(
           (MessageEvent e) {
             var data = e.data;
-            if (data is String) return;    // Messages from unit test protocol.
+            if (data is String) return; //    Messages from unit test protocol.
             completed = true;
             subscription.cancel();
             expect(data, isMap);