Remove unused pre-material NTP styling.

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

Index: chrome/android/java/res/values/colors.xml
diff --git a/chrome/android/java/res/values/colors.xml b/chrome/android/java/res/values/colors.xml
index e0538e1c52f65d6b77c260f76002b9504070ca95..a3954362f34a426ca14d8c516f749a72538af2cf 100644
--- a/chrome/android/java/res/values/colors.xml
+++ b/chrome/android/java/res/values/colors.xml
@@ -93,14 +93,13 @@
     <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>