Standardize size of WebUI controls for touch and non-touch.

chrome/browser/resources/options2/content_settings.css

 /* Copyright (c) 2012 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. */
 
 #content-settings-page {
   min-width: 600px;
 }
 
 #content-settings-exceptions-area {
   min-width: 540px;
@@ skipping 35 matching lines @@
 .otr-explanation {
   font-style: italic;
 }
 
 #content-settings-exceptions-area list {
   margin-bottom: 10px;
   margin-top: 4px;
 }
 
 #disable-plugins-container {
-  margin: 7px 0;
+  /* Same as .checkbox and .radio padding. Using padding instead of margin
+   * to ensure minimum height for tap target. */
+  padding: 7px 0;
 }
 
 div[role='listitem'][managedby] {
   color: #666;
   font-style: italic;
   position: relative;
 }
 
 .settings-list div[role='listitem'][managedby='policy'],
 .settings-list div[role='listitem'][managedby='extension'] {
   background: -webkit-linear-gradient(rgb(250, 230, 146), rgb(250, 230, 146));
   border-bottom: 1px solid rgb(201, 189, 141);
   border-top: 0;
 }
 
 list div[role='listitem'][managedby='policy'] .close-button {
   background-image: url('chrome://theme/IDR_MANAGED');
   background-size: 16px;
   opacity: 1;
 }
 
 list div[role='listitem'][managedby='extension'] .close-button {
   background-image: url('chrome://theme/IDR_EXTENSIONS_SECTION_SMALL');
   background-size: 16px;
   opacity: 1;
 }