Remove virtual keyboard support.

chrome/browser/resources/options2/language_options.html

 <div id="languagePage" class="page" hidden>
   <div class="close-button"></div>
   <h1 i18n-content="languagePage"></h1>
   <div class="content-area">
     <div id="notification">
       <span>&nbsp;</span>
       <span class="link"><span class="link-color"></span></span>
     </div>
     <!-- TODO(kevers): Fix format of i18n-content labels -->
     <div class="language-options-header">
@@ skipping 50 matching lines @@
             <label>
               <input type="checkbox">
               <span class="input-method-label"></span>
             </label>
           </div>
         </div>
         <div id="language-options-input-method-list"
              class="language-options-contents">
         </div>
 </if>
-<if expr="pp_ifdef('chromeos') and pp_ifdef('use_virtual_keyboard')">
-        <div class="language-options-contents">
-          <button id="language-options-virtual-keyboard"
-                  i18n-content="virtual_keyboard_button"></button>
-        </div>
-</if>
       </div>
 </if>
     </div>
     <div class="language-options-footer">
 <if expr="pp_ifdef('chromeos')">
       <div i18n-content="switch_input_methods_hint"></div>
       <div i18n-content="select_previous_input_method_hint"></div>
 </if>
 <if expr="not pp_ifdef('chromeos') and not is_macosx">
       <div id="spell-check-option" class="checkbox">
@@ skipping 13 matching lines @@
       </div>
 </if>
     </div>
   </div>
   <div class="action-area">
     <div class="button-strip">
       <button id="language-confirm" i18n-content="ok"></button>
     </div>
   </div>
 </div>