Settings: shared css: add .settings-box.single-column

chrome/browser/resources/settings/privacy_page/privacy_page.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/classes/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="/clear_browsing_data_dialog/clear_browsing_data_dialog.html">
 <link rel="import" href="/controls/settings_checkbox.html">
 <link rel="import" href="/settings_main/settings_main_rendered.html">
 <link rel="import" href="/settings_page/settings_animated_pages.html">
 <link rel="import" href="/settings_page/settings_subpage.html">
 <link rel="import" href="/settings_shared_css.html">
@@ skipping 66 matching lines @@
               pref="{{prefs.cros.device.attestation_for_content_protection_enabled}}"
               label="$i18n{enableContentProtectionAttestation}">
           </settings-checkbox>
           <settings-checkbox
               pref="{{prefs.settings.internet.wake_on_wifi_darkconnect}}"
               label="$i18n{wakeOnWifi}">
           </settings-checkbox>
 </if>
         </div>
 <if expr="use_nss_certs or is_win or is_macosx">
-        <div id="manageCertificates" class="settings-box two-line" actionable
-            on-tap="onManageCertificatesTap_">
-          <div class="start">
-            <div>$i18n{manageCertificates}</div>
-            <div class="secondary">$i18n{manageCertificatesDescription}</div>
-          </div>
+        <div id="manageCertificates" class="settings-box two-line single-column"
+            actionable on-tap="onManageCertificatesTap_">
+          <div>$i18n{manageCertificates}</div>
+          <div class="secondary">$i18n{manageCertificatesDescription}</div>
         </div>
 </if>
-        <div class="settings-box two-line" on-tap="onSiteSettingsTap_"
-            actionable>
-          <div class="start">
-            <div>$i18n{siteSettings}</div>
-            <div class="secondary">$i18n{siteSettingsDescription}</div>
-          </div>
+        <div class="settings-box two-line single-column" actionable
+            on-tap="onSiteSettingsTap_">
+          <div>$i18n{siteSettings}</div>
+          <div class="secondary">$i18n{siteSettingsDescription}</div>
         </div>
         <div class="settings-box">
           <paper-button on-tap="onClearBrowsingDataTap_" class="primary-button">
             $i18n{clearBrowsingData}
           </paper-button>
         </div>
       </neon-animatable>
 <if expr="use_nss_certs">
       <template is="dom-if" name="manage-certificates">
         <settings-subpage page-title="$i18n{manageCertificates}">
@@ skipping 158 matching lines @@
       <template is="dom-if" name="site-details">
         <settings-subpage
             page-title="$i18n{siteSettingsSiteDetailsPageTitle}">
           <site-details site="[[selectedSite]]"></site-details>
         </settings-subpage>
       </template>
     </settings-animated-pages>
   </template>
   <script src="privacy_page.js"></script>
 </dom-module>