[MD settings] use arrow-forward to switch direction in rtl

chrome/browser/resources/settings/default_browser_page/default_browser_page.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="/default_browser_page/default_browser_browser_proxy.html">
 <link rel="import" href="/icons.html">
 <link rel="import" href="/settings_shared_css.html">
 
 <dom-module id="settings-default-browser-page">
   <template>
     <style include="settings-shared">
       .solo-secondary {
         @apply(--settings-secondary);
         margin: 0;
       }
     </style>
     <template is="dom-if" if="[[maySetDefaultBrowser_]]">
       <div class="settings-box first two-line" on-tap="onSetDefaultBrowserTap_"
           actionable>
         <div class="start">
           <div id="canBeDefaultBrowser">$i18n{defaultBrowser}</div>
           <div class="secondary">$i18n{defaultBrowserMakeDefault}</div>
         </div>
-        <button class="icon-arrow-right" is="paper-icon-button-light"></button>
+        <button class="subpage-arrow" is="paper-icon-button-light">
+        </button>

[Dan Beam, 2016/10/14 02:27:45]

you get to unwrap more things!  lucky you!

       </div>
     </template>
     <template is="dom-if" if="[[!maySetDefaultBrowser_]]">
       <div class="settings-box first">
         <div class="solo-secondary start" hidden$="[[!isDefault_]]"
             id="isDefault">
           $i18n{defaultBrowserDefault}
         </div>
         <div class="solo-secondary start" hidden$="[[!isSecondaryInstall_]]"
           id="isSecondaryInstall">
           $i18n{defaultBrowserSecondary}
         </div>
         <div class="solo-secondary start" hidden$="[[!isUnknownError_]]"
           id="isUnknownError">
           $i18n{defaultBrowserError}
         </div>
-        <button class="icon-arrow-right" is="paper-icon-button-light"></button>
+        <button class="subpage-arrow" is="paper-icon-button-light">
+        </button>
       </div>
     </template>
   </template>
   <script src="default_browser_page.js"></script>
 </dom-module>