DevTools: cleanup button styles

third_party/WebKit/Source/devtools/front_end/help/releaseNote.css

 /*
  * Copyright 2017 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.
  */
 
 :host {
 }
 
 .hbox {
@@ skipping 57 matching lines @@
 
 .release-note-action-container > button,
 .release-note-action-container > button:hover {
     margin: 10px 20px;
     background: none;
     border: none;
     font-weight: 500;
     text-transform: uppercase;
     color: #757575;
     font-size: 13px;
+    box-shadow: none;

[luoe, 2017/05/30 22:39:45]

I realized that converting these buttons to UI.createTextButton's now leaves a
box-shadow.  This hides it until the followup CL.

[pfeldman, 2017/05/31 21:40:36]

Is there anything we need to do on the branch?

[luoe, 2017/05/31 21:42:49]

Nope!  I haven't landed any other harmony/cleanup-related style changes.

 }
 
 .release-note-action-container > button:hover {
     cursor: pointer;
     color: #666;
 }
 
 .release-note-action-container {
     flex: none;
 }
 
 .release-note-image {
     flex-shrink: 2;
 }
 
 img {
     margin: 20px;
     width: 260px;
     height: 200px;
     flex: none;
     box-shadow: 0 2px 4px rgba(0, 0, 0, .3);
 }
 
 img:hover {
     box-shadow: 0 2px 4px rgba(0, 0, 0, .5);
 }