MD Settings: cr/cros - Guest mode page visibility

chrome/browser/resources/settings/settings_shared_css.html

 <link rel="import" href="chrome://resources/cr_elements/shared_style_css.html">
 <link rel="import" href="/settings_root_css.html">
 
 <!-- Common styles for Material Design settings. -->
 <dom-module id="settings-shared">
   <template>
     <style include="cr-shared-style">
       h2 {
         align-items: center;
         display: flex;
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         min-height: var(--settings-row-min-height);
         padding: 0 20px;
       }
 
       /*
        * We use an explicit tag to remove the top border, rather than a
        * :first-of-type modifier. This is a conscious choice, please consult
        * with dbeam@ or dschuyler@ prior to changing it.
        */
       .settings-box.first,
+      .settings-box[first],
       .settings-box.continuation {
         border-top: none;
       }
 
       .settings-box.block {
         display: block;
       }
 
       /*
        * A row with two lines of text. Often the lower line will be .secondary.
@@ skipping 65 matching lines @@
 
       .favicon-image {
         background-repeat: no-repeat;
         background-size: contain;
         height: 16px;
         width: 16px;
       }
     </style>
   </template>
 </dom-module>