Drop .clang-format in ui/webui now that Chromium JS defaults are the same

ui/webui/resources/cr_elements/cr_scrollable_behavior.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview Behavior for scrollable containers with <iron-list>.
  *
  * Any containers with the 'scrollable' attribute set will have the following
  * classes toggled appropriately: can-scroll, is-scrolled, scrolled-to-bottom.
  * These classes are used to style the container div and list elements
@@ skipping 95 matching lines @@
   /**
    * This gets called once intially and any time a scrollable container scrolls.
    * @param {!HTMLElement} scrollable
    * @private
    */
   updateScroll_: function(scrollable) {
     scrollable.classList.toggle(
         'can-scroll', scrollable.clientHeight < scrollable.scrollHeight);
     scrollable.classList.toggle('is-scrolled', scrollable.scrollTop > 0);
     scrollable.classList.toggle(
-        'scrolled-to-bottom', scrollable.scrollTop + scrollable.clientHeight >=
+        'scrolled-to-bottom',
+        scrollable.scrollTop + scrollable.clientHeight >=
             scrollable.scrollHeight);
   },
 };