MD Settings: Fix date and time layout

chrome/browser/resources/settings/device_page/pointers.html

 <link rel="import" href="chrome://resources/cr_elements/cr_slider/cr_slider.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-radio-button/paper-radio-button.html">
 <link rel="import" href="../controls/settings_radio_group.html">
 <link rel="import" href="../controls/settings_toggle_button.html">
 <link rel="import" href="device_page_browser_proxy.html">
 <link rel="import" href="../settings_shared_css.html">
 
 <dom-module id="settings-pointers">
   <template>
     <style include="settings-shared">
       h2 {
         -webkit-padding-start: var(--settings-box-row-padding);
       }
 
       /* Indent layout elements under .subsection, using margin instead of
        * padding so the borders line up. */
       .subsection > .settings-box {
-        margin: 0 calc(
-            var(--settings-box-row-padding) + var(--settings-indent-width));
+        margin: 0 var(--settings-box-row-indent);
         padding: 0;
       }
 
       .subsection > .list-frame {
         -webkit-margin-start: var(--settings-indent-width);
       }
     </style>
     <div id="mouse" hidden$="[[!hasMouse]]"
         class$="[[getSubsectionClass_(hasMouse, hasTouchpad)]]">
       <!-- Subsection title only appears if both mouse and touchpad exist. -->
@@ skipping 51 matching lines @@
                 on-keydown="onLearnMoreLinkActivated_">
               $i18n{naturalScrollLearnMore}
             </a>
           </paper-radio-button>
         </settings-radio-group>
       </div>
     </div>
   </template>
   <script src="pointers.js"></script>
 </dom-module>