Remove unused code that is causing lint warnings

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>
     <color name="light_active_color">#4285F4</color>
-    <color name="input_underline_color">#e5e5e5</color>
     <color name="input_underline_error_color">#d32f2f</color>
     <color name="explanation_text_color">#909090</color>
     <color name="text_highlight_color">#C6DAFC</color>
     <color name="dark_action_bar_color">#263238</color>
     <color name="descriptive_text_color">#646464</color>
     <color name="error_text_color">#c53929</color>
     <color name="google_blue_700">#3367d6</color>
     <color name="google_red_700">#c53929</color>
     <color name="google_green_700">#0b8043</color>
     <color name="google_grey_100">#f5f5f5</color>
@@ skipping 81 matching lines @@
     <color name="ntp_bg">#fff</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_background_color">#fff</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>
 
     <!-- Contextual Search colors -->
@@ skipping 71 matching lines @@
     <!-- Bottom bar colors -->
     <color name="bottom_bar_shadow_color">#1d000000</color>
 
     <!-- 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>
 
 </resources>