Run dartfmt on all files under runtime.

runtime/observatory/tests/observatory_ui/megamorphiccache_view/element_test.dart

Index: runtime/observatory/tests/observatory_ui/megamorphiccache_view/element_test.dart
diff --git a/runtime/observatory/tests/observatory_ui/megamorphiccache_view/element_test.dart b/runtime/observatory/tests/observatory_ui/megamorphiccache_view/element_test.dart
index 06f3d657d3d2ecd27c2da2fbe91a41039a50b79d..f7783ba706e48dd8035332030d2a442654e8de4c 100644
--- a/runtime/observatory/tests/observatory_ui/megamorphiccache_view/element_test.dart
+++ b/runtime/observatory/tests/observatory_ui/megamorphiccache_view/element_test.dart
@@ -27,26 +27,41 @@ main() {
   final paths = new RetainingPathRepositoryMock();
   final instances = new InstanceRepositoryMock();
   test('instantiation', () {
-    final e = new MegamorphicCacheViewElement(vm, isolate, cache, events,
-                                              notifs, caches, retainedSizes,
-                                              reachableSizes, inbounds, paths,
-                                              instances);
+    final e = new MegamorphicCacheViewElement(
+        vm,
+        isolate,
+        cache,
+        events,
+        notifs,
+        caches,
+        retainedSizes,
+        reachableSizes,
+        inbounds,
+        paths,
+        instances);
     expect(e, isNotNull, reason: 'element correctly created');
     expect(e.isolate, equals(isolate));
     expect(e.cache, equals(cache));
   });
   test('elements created after attachment', () async {
     final caches = new MegamorphicCacheRepositoryMock(
-      getter: expectAsync((i, id) async {
-        expect(i, equals(isolate));
-        expect(id, equals(cache.id));
-        return cache;
-      }, count: 1)
-    );
-    final e = new MegamorphicCacheViewElement(vm, isolate, cache, events,
-                                              notifs, caches, retainedSizes,
-                                              reachableSizes, inbounds, paths,
-                                              instances);
+        getter: expectAsync((i, id) async {
+      expect(i, equals(isolate));
+      expect(id, equals(cache.id));
+      return cache;
+    }, count: 1));
+    final e = new MegamorphicCacheViewElement(
+        vm,
+        isolate,
+        cache,
+        events,
+        notifs,
+        caches,
+        retainedSizes,
+        reachableSizes,
+        inbounds,
+        paths,
+        instances);
     document.body.append(e);
     await e.onRendered.first;
     expect(e.children.length, isNonZero, reason: 'has elements');