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

chrome/browser/resources/settings/about_page/detailed_build_info.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="/about_page/about_page_browser_proxy.html">
 <link rel="import" href="/about_page/channel_switcher_dialog.html">
 <link rel="import" href="/i18n_setup.html"
 <link rel="import" href="/settings_shared_css.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 
 <dom-module id="settings-detailed-build-info">
   <template>
     <style include="settings-shared">
       .secondary {
         -webkit-user-select: text;
       }
     </style>
-    <div class="settings-box two-line">
-      <div class="start">
-        <div>$i18n{aboutPlatformLabel}</div>
-        <div class="secondary" id="osVersion">[[versionInfo_.osVersion]]</div>
-      </div>
+    <div class="settings-box two-line single-column">
+      <div>$i18n{aboutPlatformLabel}</div>
+      <div class="secondary" id="osVersion">[[versionInfo_.osVersion]]</div>
     </div>
-    <div class="settings-box two-line"
+    <div class="settings-box two-line single-column"
         hidden$="[[!shouldShowVersion_(versionInfo_.osFirmware)]]">
-      <div class="start">
-        <div>$i18n{aboutFirmwareLabel}</div>
-        <div class="secondary" id="osFirmware">[[versionInfo_.osFirmware]]</div>
-      </div>
+      <div>$i18n{aboutFirmwareLabel}</div>
+      <div class="secondary" id="osFirmware">[[versionInfo_.osFirmware]]</div>
     </div>
     <div class="settings-box two-line">
       <div class="start">
         <div>$i18n{aboutChannelLabel}</div>
         <div class="secondary">[[currentlyOnChannelText_]]</div>
       </div>
       <div class="secondary-action">
         <paper-button on-tap="onChangeChannelTap_"
             disabled="[[!canChangeChannel_]]">
           $i18n{aboutChangeChannel}
         </paper-button>
         <iron-icon icon="cr:domain" hidden="[[canChangeChannel_]]"</iron-icon>
       </div>
       <template is="dom-if" if="[[showChannelSwitcherDialog_]]" restamp>
         <settings-channel-switcher-dialog></settings-channel-switcher-dialog>
       </template>
     </div>
-    <div class="settings-box two-line"
+    <div class="settings-box two-line single-column"
         hidden$="[[!shouldShowVersion_(versionInfo_.arcVersion)]]">
-      <div class="start">
-        <div>$i18n{aboutArcVersionLabel}</div>
-        <div class="secondary" id="arcVersion">[[versionInfo_.arcVersion]]</div>
-      </div>
+      <div>$i18n{aboutArcVersionLabel}</div>
+      <div class="secondary" id="arcVersion">[[versionInfo_.arcVersion]]</div>
     </div>
-    <div class="settings-box two-line">
-      <div class="start">
-        <div>Blink</div><!-- No need to localize. -->
-        <div class="secondary">$i18n{aboutBlinkVersion}</div>
-      </div>
+    <div class="settings-box two-line single-column">
+      <div>Blink</div><!-- No need to localize. -->
+      <div class="secondary">$i18n{aboutBlinkVersion}</div>
     </div>
-    <div class="settings-box two-line">
-      <div class="start">
-        <div>V8</div>
-        <div class="secondary">$i18n{aboutJsEngineVersion}</div>
-      </div>
+    <div class="settings-box two-line single-column">
+      <div>V8</div>
+      <div class="secondary">$i18n{aboutJsEngineVersion}</div>
     </div>
-    <div class="settings-box two-line">
-      <div class="start">
-        <div>$i18n{aboutUserAgentLabel}</div>
-        <div class="secondary">$i18n{aboutUserAgent}</div>
-      </div>
+    <div class="settings-box two-line single-column">
+      <div>$i18n{aboutUserAgentLabel}</div>
+      <div class="secondary">$i18n{aboutUserAgent}</div>
     </div>
-    <div class="settings-box two-line">
-      <div class="start">
-        <div>$i18n{aboutCommandLineLabel}</div>
-        <div class="secondary">$i18n{aboutCommandLine}</div>
-      </div>
+    <div class="settings-box two-line single-column">
+      <div>$i18n{aboutCommandLineLabel}</div>
+      <div class="secondary">$i18n{aboutCommandLine}</div>
     </div>
-    <div class="settings-box two-line">
-      <div class="start">
-        <div>$i18n{aboutBuildDateLabel}</div>
-        <div class="secondary">$i18n{aboutBuildDate}</div>
-      </div>
+    <div class="settings-box two-line single-column">
+      <div>$i18n{aboutBuildDateLabel}</div>
+      <div class="secondary">$i18n{aboutBuildDate}</div>
     </div>
   </template>
   <script src="detailed_build_info.js"></script>
 </dom-module>