[MD settings] adjust button layout

ui/webui/resources/cr_elements/shared_style_css.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/cr_elements/shared_vars_css.html">
 <link rel="import" href="hidden_style_css.html">
 
 <!-- Common styles for Material Design WebUI. Included directly in
   settings_shared_css.html. -->
 <dom-module id="cr-shared-style">
   <template>
     <style include="cr-hidden-style">
       :host-context([dir=rtl]) button[is='paper-icon-button-light'] {
@@ skipping 31 matching lines @@
         font-weight: 500;
         line-height: 154%;
         padding: 8px 16px;
       }
 
       [actionable] {
         @apply(--cr-actionable);
       }
 
       button[is='paper-icon-button-light'] {
-        @apply(--cr-paper-icon-button-margin);
+        -webkit-margin-end: var(--cr-icon-ripple-margin);
+        -webkit-margin-start: 16px;
         background-position: center;
         background-repeat: no-repeat;
         background-size: var(--cr-icon-size);
         flex-shrink: 0;
         height: var(--cr-icon-ripple-size);
         width: var(--cr-icon-ripple-size);
       }
 
       button[is='paper-icon-button-light'].subpage-arrow {
         background-image: url(chrome://resources/images/arrow_right.svg);
@@ skipping 55 matching lines @@
       [selectable]:focus,
       [selectable] > :focus {
         @apply(--cr-selectable-focus);
       }
       [selectable] > * {
         @apply(--cr-actionable);
       }
     </style>
   </template>
 </dom-module>