Revert "Fix observatory tests broken by running dartfmt."

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

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of mocks;
 
 class MegamorphicCacheRefMock implements M.MegamorphicCacheRef {
   final String id;
   final String selector;
 
-  const MegamorphicCacheRefMock(
-      {this.id: 'megamorphiccache-id', this.selector: 'selector'});
+  const MegamorphicCacheRefMock({this.id : 'megamorphiccache-id',
+                                 this.selector: 'selector'});
 }
 
 class MegamorphicCacheMock implements M.MegamorphicCache {
   final String id;
   final M.ClassRef clazz;
   final String vmName;
   final int size;
   final String selector;
   final int mask;
   final M.InstanceRef buckets;
   final M.InstanceRef argumentsDescriptor;
 
-  const MegamorphicCacheMock(
-      {this.id: 'megamorphiccache-id',
-      this.vmName: 'megamorphiccache-vmName',
-      this.clazz: const ClassRefMock(),
-      this.size: 1,
-      this.selector: 'selector',
-      this.mask: 0,
-      this.buckets: const InstanceRefMock(),
-      this.argumentsDescriptor: const InstanceRefMock()});
+  const MegamorphicCacheMock({this.id : 'megamorphiccache-id',
+                              this.vmName: 'megamorphiccache-vmName',
+                              this.clazz: const ClassRefMock(),
+                              this.size: 1, this.selector: 'selector',
+                              this.mask: 0,
+                              this.buckets: const InstanceRefMock(),
+                              this.argumentsDescriptor: const InstanceRefMock()
+                             });
 }