Run dartfmt on all files under runtime.

runtime/observatory/tests/observatory_ui/mocks/objects/class.dart

Index: runtime/observatory/tests/observatory_ui/mocks/objects/class.dart
diff --git a/runtime/observatory/tests/observatory_ui/mocks/objects/class.dart b/runtime/observatory/tests/observatory_ui/mocks/objects/class.dart
index bcb465e79f4126584db557ec5cb96510055fd26b..22febf28dd29c75e54986e25ab36b9d6c407c0a0 100644
--- a/runtime/observatory/tests/observatory_ui/mocks/objects/class.dart
+++ b/runtime/observatory/tests/observatory_ui/mocks/objects/class.dart
@@ -34,12 +34,27 @@ class ClassMock implements M.Class {
   final bool hasAllocations;
   bool get hasNoAllocations => !hasAllocations;
   final bool traceAllocations;
-  const ClassMock({this.id: 'c-id', this.name: 'c-name', this.vmName: 'c-name',
-                   this.clazz, this.size, this.error, this.isAbstract: false,
-                   this.isConst: false, this.isPatch: false, this.library,
-                   this.location, this.superclass, this.superType,
-                   this.interfaces: const [], this.fields: const [],
-                   this.functions: const [], this.mixin,
-                   this.subclasses: const [], this.hasAllocations: false,
-                   this.newSpace, this.oldSpace, this.traceAllocations: false});
+  const ClassMock(
+      {this.id: 'c-id',
+      this.name: 'c-name',
+      this.vmName: 'c-name',
+      this.clazz,
+      this.size,
+      this.error,
+      this.isAbstract: false,
+      this.isConst: false,
+      this.isPatch: false,
+      this.library,
+      this.location,
+      this.superclass,
+      this.superType,
+      this.interfaces: const [],
+      this.fields: const [],
+      this.functions: const [],
+      this.mixin,
+      this.subclasses: const [],
+      this.hasAllocations: false,
+      this.newSpace,
+      this.oldSpace,
+      this.traceAllocations: false});
 }