Run dartfmt on all files under runtime.

runtime/observatory/tests/service/malformed_test.dart

Index: runtime/observatory/tests/service/malformed_test.dart
diff --git a/runtime/observatory/tests/service/malformed_test.dart b/runtime/observatory/tests/service/malformed_test.dart
index ea3a093e61736668246641c2ee531436edabdd20..ca9d5a2829f1c63e18407303035559baff057855 100644
--- a/runtime/observatory/tests/service/malformed_test.dart
+++ b/runtime/observatory/tests/service/malformed_test.dart
@@ -12,7 +12,7 @@ var tests = [
     bool caughtException;
     try {
       await isolate.invokeRpc('_respondWithMalformedObject', {});
-      expect(false, isTrue, reason:'Unreachable');
+      expect(false, isTrue, reason: 'Unreachable');
     } on MalformedResponseRpcException catch (e) {
       caughtException = true;
       expect(e.message, equals("Response is missing the 'type' field"));
@@ -25,13 +25,14 @@ var tests = [
     bool caughtException;
     try {
       await isolate.invokeRpc('_respondWithMalformedJson', {});
-      expect(false, isTrue, reason:'Unreachable');
+      expect(false, isTrue, reason: 'Unreachable');
     } on NetworkRpcException catch (e) {
       caughtException = true;
-      expect(e.message,
-             startsWith("Canceling request: "
-                        "Connection saw corrupt JSON message: "
-                        "FormatException: Unexpected character"));
+      expect(
+          e.message,
+          startsWith("Canceling request: "
+              "Connection saw corrupt JSON message: "
+              "FormatException: Unexpected character"));
     }
     expect(caughtException, isTrue);
   },