Add button to reset auto-open pref in Chrome OS settings

chrome/browser/resources/options/browser_options.html

 <div id="settings" class="page" hidden>
   <header>
     <h1 i18n-content="settingsTitle"></h1>
   </header>
   <include src="reset_profile_settings_banner.html">
   <include src="automatic_settings_reset_banner.html">
 <if expr="chromeos">
   <include src="secondary_user_banner.html">
   <section>
     <div id="network-section-header" class="section-header">
@@ skipping 600 matching lines @@
               pref="gdata.disabled"
               metric="Options_DisableGData">
           <span>
             <label for="drive-disabled" i18n-content="disableGData"></label>
             <span class="controlled-setting-indicator" pref="gdata.disabled">
             </span>
           </span>
         </span>
       </div>
 </if>
-<if expr="not chromeos">
       <div id="auto-open-file-types-section" hidden>
         <div id="auto-open-file-types-container">
-          <div id="auto-open-file-types-label"
+          <div id="auto-open-file-types-label" class="settings-row"
               i18n-content="autoOpenFileTypesInfo"></div>
-          <button id="autoOpenFileTypesResetToDefault"
-              i18n-content="autoOpenFileTypesResetToDefault"></button>
+          <div class="settings-row">
+            <button id="autoOpenFileTypesResetToDefault"
+                i18n-content="autoOpenFileTypesResetToDefault"></button>
+            </div>
         </div>
       </div>
-</if>
     </div>
   </section>
   <section>
       <h3 i18n-content="advancedSectionTitleSecurity"></h3>
       <div>
 <if expr="use_nss or is_win or is_macosx">
         <div class="settings-row">
           <button id="certificatesManageButton"
               i18n-content="certificatesManageButton"></button>
         </div>
@@ skipping 299 matching lines @@
     </div>
   </section>
   </div>  <!-- advanced-settings-container -->
   </div>  <!-- advanced-settings -->
   <footer>
     <button id="advanced-settings-expander" class="link-button"
         i18n-content="showAdvancedSettings">
     </button>
   </footer>
   </div>