Revert "Fix observatory tests broken by running dartfmt."

runtime/observatory/tests/service/get_retained_size_rpc_test.dart

Index: runtime/observatory/tests/service/get_retained_size_rpc_test.dart
diff --git a/runtime/observatory/tests/service/get_retained_size_rpc_test.dart b/runtime/observatory/tests/service/get_retained_size_rpc_test.dart
index d28b51877ffa6c76ff1f4e17ddcb32262e853b57..96df916b617d7c9de434b67a17a01aa839e6dedd 100644
--- a/runtime/observatory/tests/service/get_retained_size_rpc_test.dart
+++ b/runtime/observatory/tests/service/get_retained_size_rpc_test.dart
@@ -29,7 +29,8 @@ eval(Isolate isolate, String expression) async {
 var tests = [
   (Isolate isolate) async {
     // One instance of _TestClass retained.
-    var evalResult = await eval(isolate, 'myVar = new _TestClass(null, null)');
+    var evalResult = await eval(
+        isolate, 'myVar = new _TestClass(null, null)');
     var params = {
       'targetId': evalResult['id'],
     };