Adding elevation to NTP snippets

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 90 matching lines @@
     <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>
-    <color name="snippets_separator">#19000000</color>
 
     <!-- Contextual Search colors -->
     <color name="contextual_search_promo_text_color">#333333</color>
     <color name="contextual_search_promo_background_color">#EEEEEE</color>
     <color name="contextual_search_promo_border_color">#C2C2C2</color>
 
     <!-- Progress Bar colors -->
     <color name="progress_bar_foreground">@color/light_active_color</color>
     <color name="progress_bar_foreground_white">@android:color/white</color>
     <color name="progress_bar_background">#3d4386f7</color>
@@ skipping 58 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>