Replace TOUCH_UI condition in WebUI with dynamic flag.

chrome/browser/resources/options/language_options.css

 .language-options {
   display: -webkit-box;
   margin: 10px 0;
 }
 
 .language-options-lower-left button,
 .language-options-right button {
   min-width: 70px;
 }
 
@@ skipping 100 matching lines @@
   overflow: hidden;
   pointer-events: none;
   position: fixed;
   z-index: 10;
 }
 
 #language-options-ui-restart-button {
   margin-top: 12px;
 }
 
-<if expr="not pp_ifdef('touchui')">
+/*
+ * In ChromeOS we present the language choices as a big page of links.
+ */
+
 html[os=chromeos] #add-language-overlay-language-list {
   -webkit-column-count: 2;
   -webkit-column-gap: 20px;
 }
 
 html[os=chromeos] #add-language-overlay-cancel-button {
   /* Place the button in the center. */
   display: block;
   margin: auto;
   margin-top: 15px;
 }
 
 html[os=chromeos] #add-language-overlay-page {
   width: 800px;
   padding: 20px;
 }
 
 html[os=chromeos] #add-language-overlay-page button.link-button {
   padding: 0;
   text-align: left;
 }
 
 html[os=chromeos] #add-language-overlay-page ul {
   padding: 0;
   margin: 0;
 }
-</if>
 
 /* TODO(kochi): This is temporary copy from new_tab.css */
 /* Notification */
 
 #notification {
   position: relative;
   background-color: hsl(52, 100%, 80%);
   border: 1px solid rgb(211, 211, 211);
   border-radius: 6px;
   padding: 7px 15px;
@@ skipping 59 matching lines @@
 
 button[disabled].text-button,
 button[disabled].text-button:active,
 button[disabled].text-button:focus,
 button[disabled].text-button:hover {
   -webkit-box-shadow: none;
   background: transparent none;
   border-color: transparent;
   color: #AAA;
 }