MD Settings: Internet: Add/fix remaining policy items

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_vars_css.html">
 
 <!-- Common styles for Material Design settings. -->
 <dom-module id="settings-shared">
   <template>
     <style include="cr-shared-style">
       /* Included here so we don't have to include "iron-positioning" in every
        * stylesheet. See crbug.com/498405. */
       [hidden] {
@@ skipping 359 matching lines @@
         -webkit-border-start: var(--settings-separator-line);
         -webkit-margin-start: 20px;
         -webkit-padding-start: 20px;
         align-items: center;
         display: flex;
         flex-shrink: 0;
         height: var(--settings-row-min-height);
       }
 
       .settings-box paper-item iron-icon {
-        /* Same padding as paper-icon-button. */
-        padding: 8px;
+        padding: var(--cr-icon-padding);
       }
 
       /* Helper for a list frame to automatically avoid the separator line. */
       .vertical-list > *:not(:first-of-type) {
         border-top: var(--settings-separator-line);
       }
 
       .settings-checkbox-spacer {
         -webkit-margin-start: calc(
             var(--checkbox-margin-start) +
@@ skipping 45 matching lines @@
       /* Turns the arrow direction downwards, when the bubble is placed above
        * the anchor element */
       .search-bubble-innards.above::after {
         -webkit-transform: rotate(-135deg);
         bottom: -5px;
         top: auto;
       }
     </style>
   </template>
 </dom-module>