Remove document mode opt-out promo.

chrome/android/java/res/values/colors.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>
     <!-- Common colors -->
     <color name="default_text_color">#333</color>
     <color name="default_primary_color">#f2f2f2</color>
     <color name="light_normal_color">#5A5A5A</color>
@@ skipping 144 matching lines @@
     <color name="bookmark_detail_section">#7C7B79</color>
     <color name="bookmark_app_bar_shadow_color">#1D000000</color>
     <color name="bookmark_drawer_selected_background_color">#F0F0F0</color>
     <color name="bookmark_list_item_highlight_color">#804281f4</color>
     <color name="bookmark_icon_background_color">#ff787878</color>
     <color name="bookmark_appbar_background">@color/default_primary_color</color>
 
     <!-- Bookmark widget colors -->
     <color name="bookmark_widget_pressed_highlight">#1D000000</color>
 
-    <!-- Opt out promo -->
-    <color name="opt_out_text_color">#646464</color>
-
     <!-- Media UI Colors -->
     <color name="media_session_icon_color">#14181C</color>
 
     <!-- Physical Web colors -->
     <color name="physical_web_header_color">#333</color>
     <color name="physical_web_url_color">#969696</color>
     <color name="physical_web_url_description_color">#646464</color>
     <color name="physical_web_logo_gray_tint">#ccc</color>
 
     <!-- Physical Web diagnostics colors -->
     <color name="physical_web_diags_success_color">#00933b</color>
     <color name="physical_web_diags_failure_color">#f90101</color>
     <color name="physical_web_diags_indeterminate_color">#f2b50f</color>
 
     <!-- Bottom bar colors -->
     <color name="bottom_bar_shadow_color">#1d000000</color>
 
 </resources>