Run dartfmt on all files under runtime.

runtime/observatory/tests/service/native_metrics_test.dart

Index: runtime/observatory/tests/service/native_metrics_test.dart
diff --git a/runtime/observatory/tests/service/native_metrics_test.dart b/runtime/observatory/tests/service/native_metrics_test.dart
index dd713a26071030197206bea3f2e79eb6d53c35dd..0803fabc684eaec119fc29b72f51c67fae8b0043 100644
--- a/runtime/observatory/tests/service/native_metrics_test.dart
+++ b/runtime/observatory/tests/service/native_metrics_test.dart
@@ -16,40 +16,37 @@ void script() {
 }
 
 var tests = [
-
   (Isolate isolate) async {
     Map metrics = await isolate.refreshNativeMetrics();
     expect(metrics.length, greaterThan(1));
     expect(metrics.length, greaterThan(1));
-    var foundOldHeapCapacity = metrics.values.any(
-        (m) => m.name == 'heap.old.capacity');
+    var foundOldHeapCapacity =
+        metrics.values.any((m) => m.name == 'heap.old.capacity');
     expect(foundOldHeapCapacity, equals(true));
   },
-
   (Isolate isolate) async {
-    var params = { 'metricId': 'metrics/native/heap.old.used' };
+    var params = {'metricId': 'metrics/native/heap.old.used'};
     ServiceMetric counter =
-      await isolate.invokeRpc('_getIsolateMetric', params);
+        await isolate.invokeRpc('_getIsolateMetric', params);
     expect(counter.type, equals('Counter'));
     expect(counter.name, equals('heap.old.used'));
   },
-
   (Isolate isolate) async {
     bool caughtException;
     try {
-      await isolate.invokeRpc('_getIsolateMetric',
-                              { 'metricId': 'metrics/native/doesnotexist' });
-      expect(false, isTrue, reason:'Unreachable');
+      await isolate.invokeRpc(
+          '_getIsolateMetric', {'metricId': 'metrics/native/doesnotexist'});
+      expect(false, isTrue, reason: 'Unreachable');
     } on ServerRpcException catch (e) {
       caughtException = true;
       expect(e.code, equals(ServerRpcException.kInvalidParams));
-      expect(e.message,
-             "_getIsolateMetric: invalid 'metricId' "
-             "parameter: metrics/native/doesnotexist");
+      expect(
+          e.message,
+          "_getIsolateMetric: invalid 'metricId' "
+          "parameter: metrics/native/doesnotexist");
     }
     expect(caughtException, isTrue);
   },
-
 ];
 
 main(args) => runIsolateTests(args, tests, testeeBefore: script);