DevTools: update buttons to new style

third_party/WebKit/Source/devtools/front_end/mobile_throttling/networkConditionsSettingsTab.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.
  */
 
 :host {
     overflow:hidden;
 }
 
 .header {
     padding: 0 0 6px;
     border-bottom: 1px solid #EEEEEE;
     font-size: 18px;
     font-weight: normal;
     flex: none;
 }
 
 .add-conditions-button {
     flex: none;
-    margin: 10px 0;
+    margin: 10px 2px;
     min-width: 140px;
     align-self: flex-start;
 }
 
 .conditions-list {
     max-width: 500px;
     min-width: 340px;
     flex: auto;
 }
 
@@ skipping 53 matching lines @@
     width: 100%;
     text-align: inherit;
 }
 
 .conditions-edit-optional {
     position: absolute;
     bottom: -20px;
     right: 0;
     color: rgb(128, 128, 128);
 }