DevTools: format keys in object previews using sans serif.

third_party/WebKit/Source/devtools/front_end/object_ui/objectPropertiesSection.css

 /*
  * Copyright 2015 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
-.object-properties-section .name {
-    color: rgb(136, 19, 145);
-    flex-shrink: 0;
-}
-
 .object-properties-section-separator {
     flex-shrink: 0;
     padding-right: 5px;
 }
 
 .object-properties-section-dimmed {
     opacity: 0.6;
 }
 
 .object-properties-section {
@@ skipping 27 matching lines @@
 }
 
 .object-properties-section .synthetic-property {
     font-style: italic;
 }
 
 .object-properties-section-root-element {
     display: flex;
     flex-direction: row;
 }