Run dartfmt on all files under runtime.

runtime/observatory/tests/observatory_ui/mocks/repositories/eval.dart

Index: runtime/observatory/tests/observatory_ui/mocks/repositories/eval.dart
diff --git a/runtime/observatory/tests/observatory_ui/mocks/repositories/eval.dart b/runtime/observatory/tests/observatory_ui/mocks/repositories/eval.dart
index c0020c3f2350ed0996ea54ad6dfe2894ac17421e..5f143fa09d398c5f1eba54d1c91a46fe3414c938 100644
--- a/runtime/observatory/tests/observatory_ui/mocks/repositories/eval.dart
+++ b/runtime/observatory/tests/observatory_ui/mocks/repositories/eval.dart
@@ -4,18 +4,16 @@
 
 part of mocks;
 
-typedef Future<M.Object> EvalRepositoryMockCallback(M.IsolateRef isolate,
-                                                    M.ObjectRef context,
-                                                    String expression);
+typedef Future<M.Object> EvalRepositoryMockCallback(
+    M.IsolateRef isolate, M.ObjectRef context, String expression);
 
 class EvalRepositoryMock implements M.EvalRepository {
   final EvalRepositoryMockCallback _get;
 
-  EvalRepositoryMock({EvalRepositoryMockCallback getter})
-    : _get = getter;
+  EvalRepositoryMock({EvalRepositoryMockCallback getter}) : _get = getter;
 
-  Future<M.Object> evaluate(M.IsolateRef isolate, M.ObjectRef context,
-                            String expression){
+  Future<M.Object> evaluate(
+      M.IsolateRef isolate, M.ObjectRef context, String expression) {
     if (_get != null) {
       return _get(isolate, context, expression);
     }