[Smartlock settings] Hide options header when SmartLock is disabled.

correct.

Bug: 894600
Change-Id: I8357061d91a0f2c63ec4c60c2d0bb97688849c88
Tested: Manually flipped switch on and off and verified that it looks
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1664516
Commit-Queue: Jeremy Klein <jlklein@chromium.org>
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Auto-Submit: Jeremy Klein <jlklein@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#670212}

chrome/browser/resources/settings/multidevice_page/multidevice_smartlock_subpage.html

@@ -30,12 +30,12 @@
           page-content-data="[[pageContentData]]">
       </settings-multidevice-feature-toggle>
     </div>
-    <div class="settings-box first line-only">
-      <h2 class="start first">
-        $i18n{multideviceSmartLockOptions}
-      </h2>
-    </div>
     <iron-collapse opened="[[smartLockEnabled_]]">
+      <div class="settings-box first line-only">
+          <h2 class="start first">
+            $i18n{multideviceSmartLockOptions}
+          </h2>
+      </div>
       <div class="list-frame">
         <cr-radio-group
             selected="[[smartLockSignInEnabled_]]"