Format all remaining unformatted runtime files other than multitests.

runtime/observatory/lib/src/elements/stack_trace_tree_config.dart

Index: runtime/observatory/lib/src/elements/stack_trace_tree_config.dart
diff --git a/runtime/observatory/lib/src/elements/stack_trace_tree_config.dart b/runtime/observatory/lib/src/elements/stack_trace_tree_config.dart
index 2dc2b449b7b8dadcd4f264f4d6195a123c232e5f..7597eaf724f76d39eb12fd1cd8b09a9f28fb6ff5 100644
--- a/runtime/observatory/lib/src/elements/stack_trace_tree_config.dart
+++ b/runtime/observatory/lib/src/elements/stack_trace_tree_config.dart
@@ -180,8 +180,8 @@ class StackTraceTreeConfigElement extends HtmlElement implements Renderable {
         ..value = modeToString(_mode)
         ..children = ProfileTreeMode.values.map((mode) {
           return new OptionElement(
-              value: modeToString(mode),
-              selected: _mode == mode)..text = modeToString(mode);
+              value: modeToString(mode), selected: _mode == mode)
+            ..text = modeToString(mode);
         }).toList(growable: false)
         ..onChange.listen((_) {
           _mode = ProfileTreeMode.values[s.selectedIndex];