[Custom Tab]Adjust padding for "Powered by Chrome" prompt text

chrome/android/java/res/values/dimens.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2014 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. -->
 
 <resources>
     <!-- Connection info popup dimensions -->
     <dimen name="connection_info_padding_wide">24dp</dimen>
     <dimen name="connection_info_padding_thin">16dp</dimen>
 
@@ skipping 267 matching lines @@
     <dimen name="enhanced_bookmark_minimum_dialog_size_tablet">500dp</dimen>
     <dimen name="enhanced_bookmark_drawer_drawable_padding">18dp</dimen>
 
     <!-- Custom Tabs dimensions -->
     <dimen name="custom_tabs_toolbar_maxWidth">60dp</dimen>
     <dimen name="custom_tabs_toolbar_vertical_padding">16dp</dimen>
     <dimen name="toolbar_icon_height">24dp</dimen>
     <dimen name="min_toolbar_icon_side_padding">6dp</dimen>
     <dimen name="custom_tabs_url_text_size">12sp</dimen>
     <dimen name="custom_tabs_title_text_size">16sp</dimen>
-    <dimen name="menu_footer_height">28dp</dimen>
 
     <!-- Favicon dimensions -->
     <dimen name="default_favicon_size">16dp</dimen>
 
     <!-- Media UI dimensions -->
     <!-- The media_session_icon_size is just big enough to make sure Android doesn't discard the
          icon but otherwise, the icon is meant to be a flat color so it doesn't really matter. -->
     <dimen name="media_session_icon_size">48dp</dimen>
 </resources>