Remove unused pre-material NTP styling.

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 75 matching lines @@
     <!-- As in dimens.xml, signin uses values from the First Run Experience -->
     <color name="signin_head_background">#fff</color>
     <color name="signin_body_background">#fafafa</color>
     <color name="signin_border_line_color">#000</color>
 
     <!-- Sad Tab colors -->
     <color name="sad_tab_header_text_color">#333333</color>
     <color name="sad_tab_body_text_color">#646464</color>
 
     <!-- NTP Colors. Used on the bookmarks and recent tabs pages. -->
-    <color name="ntp_bg">#fff</color>
+    <color name="ntp_bg">#f2f2f2</color>
     <color name="ntp_bg_incognito">#222</color>
     <color name="ntp_search_box_hint">#969696</color>
     <color name="ntp_list_item_text">#333</color>
     <color name="ntp_list_header_text">#333</color>
     <color name="ntp_list_header_subtext">#969696</color>
     <color name="ntp_list_header_subtext_active">#7cadff</color>
-    <color name="ntp_material_design_bg">#f2f2f2</color>
     <color name="snippets_thumnail_placeholder_bg">#f2f2f2</color>
     <color name="snippets_thumnail_placeholder_fg">#757575</color>
     <color name="snippets_publisher_name_color">#646464</color>
     <color name="snippets_text_color">#646464</color>
     <color name="snippets_list_header_text_color">#646464</color>
     <color name="snippets_headline_text_color">#333333</color>
 
     <!-- Most Visited colors. -->
     <color name="most_visited_text">#6f6f6f</color>
     <color name="most_visited_offline_badge_tint">#4285f4</color>
@@ skipping 75 matching lines @@
     <!-- Payments UI colors -->
     <color name="payments_ui_scrim">#000000</color>
     <color name="payments_section_edit_background">#f5f5f5</color>
     <color name="payments_section_chevron">#b2b2b2</color>
     <color name="payments_section_separator">#e0e0e0</color>
 
     <!-- Other colors -->
     <color name="selectable_list_item_highlight_color">#804281f4</color>
 
 </resources>