remove the unused collapsible from options

options.html

@@ -230,20 +230,7 @@
       </div>
 
       <div class="block" id="advanced">
-        <div class="collapsible-resizer">
+        <h1 i18n-text="optionsAdvanced"></h1>
-          <h1 i18n-text="optionsAdvanced">
-            <a class="svg-inline-wrapper is-collapsed" tabindex="0">
-              <svg class="svg-icon" viewBox="0 0 1792 1792">
-                <path fill-rule="evenodd" d="M1408 704q0 26-19 45l-448 448q-19 19-45 19t-45-19l-448-448q-19-19-19-45t19-45 45-19h896q26 0 45 19t19 45z"/>
-              </svg>
-            </a>
-            <a class="svg-inline-wrapper is-expanded" tabindex="0">
-              <svg class="svg-icon" viewBox="0 0 1792 1792">
-                <path fill-rule="evenodd" d="M1408 1216q0 26-19 45t-45 19h-896q-26 0-45-19t-19-45 19-45l448-448q19-19 45-19t45 19l448 448q19 19 19 45z"/>
-              </svg>
-            </a>
-          </h1>
-        </div>
         <div class="items">
           <label class="chromium-only">
             <span i18n-text="optionsAdvancedStyleViaXhr">

options/options.css

@@ -120,14 +120,6 @@ a:hover .svg-icon,
   border-bottom: none;
 }
 
-.collapsed, .collapsible h1 {
-  cursor: pointer;
-}
-
-.collapsed .items {
-  display: none;
-}
-
 h1 {
   min-width: 30%;
   width: 30%;
@@ -273,86 +265,10 @@ input[type="color"] {
   display: none;
 }
 
-#advanced.collapsible.collapsed {
-  height: 30px;
-  padding: 0;
-  margin: 0;
-  justify-content: center;
-}
-
 html:not(.firefox):not(.opera) #updates {
   margin-bottom: 0;
 }
 
-#advanced.collapsible:not(.collapsed) {
-  margin-bottom: 0;
-}
-
-#advanced.collapsible:not(.collapsed) .collapsible-resizer,
-#advanced:not(.collapsible) .collapsible-resizer {
-  padding-right: 8px;
-  box-sizing: border-box;
-  min-width: 30%;
-  width: 30%;
-}
-
-#advanced.collapsible h1 {
-  width: unset;
-  padding: 0;
-  color: #333;
-  transition: color .5s;
-  display: inline-flex;
-  align-items: center;
-}
-
-#advanced:not(.collapsible) .collapsible-resizer h1 {
-  width: unset;
-  padding: 0;
-  display: inline-flex;
-}
-
-#advanced.collapsible:not(.collapsed) h1:hover {
-  color: #666;
-}
-
-#advanced.collapsible.collapsed h1 {
-  padding: 0;
-  color: #666;
-}
-
-#advanced.collapsible.collapsed:hover h1 {
-  color: #333;
-}
-
-.collapsible-resizer .svg-icon {
-  fill: #333;
-  transition: fill .5s;
-  height: 16px;
-  width: 16px;
-}
-
-#advanced.collapsible.collapsed .collapsible-resizer .svg-icon,
-#advanced.collapsible:not(.collapsed) .collapsible-resizer h1:hover .svg-icon {
-  fill: #666;
-}
-
-#advanced.collapsible.collapsed:hover .collapsible-resizer .svg-icon {
-  fill: #333;
-}
-
-#advanced.collapsible h1 .svg-icon {
-  margin-left: 2px;
-}
-
-#advanced.collapsible.collapsed .is-expanded,
-#advanced:not(.collapsible) .collapsible-resizer .svg-icon {
-  display: none;
-}
-
-#advanced.collapsible:not(.collapsed) .is-collapsed {
-  display: none;
-}
-
 .svg-inline-wrapper .svg-icon {
   width: 16px;
   height: 16px;

options/options.js

@@ -11,10 +11,8 @@
   setupLivePrefs
 */// dom.js
 /* global
-  CHROME
   CHROME_POPUP_BORDER_BUG
   FIREFOX
-  UA
   URLS
   capitalize
   clamp
@@ -27,23 +25,7 @@ setupLivePrefs();
 $$('input[min], input[max]').forEach(enforceInputRange);
 
 if (CHROME_POPUP_BORDER_BUG) {
-  const borderOption = $('.chrome-no-popup-border');
+  $('.chrome-no-popup-border').classList.remove('chrome-no-popup-border');
-  if (borderOption) {
-    borderOption.classList.remove('chrome-no-popup-border');
-  }
-}
-
-// collapse #advanced block in Chrome pre-66 (classic chrome://extensions UI)
-if (!FIREFOX && !UA.opera && CHROME < 66) {
-  const block = $('#advanced');
-  $('h1', block).onclick = event => {
-    event.preventDefault();
-    block.classList.toggle('collapsed');
-    const isCollapsed = block.classList.contains('collapsed');
-    const visibleToggle = $(isCollapsed ? '.is-collapsed' : '.is-expanded', block);
-    visibleToggle.focus();
-  };
-  block.classList.add('collapsible', 'collapsed');
 }
 
 if (FIREFOX && 'update' in (chrome.commands || {})) {