Remove unused pre-material NTP styling.

chrome/android/java/res/layout/new_tab_page_view.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2015 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. -->
 
 <org.chromium.chrome.browser.ntp.NewTabPageView
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:paddingTop="@dimen/tab_strip_height" >
 
     <ViewStub
         android:id="@+id/new_tab_page_layout_stub"
         android:inflatedId="@+id/ntp_scrollview"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:layout_marginBottom="48dp" />
 
     <!-- Bookmarks and Recent tabs buttons -->
     <org.chromium.chrome.browser.ntp.NewTabPageToolbar
         android:id="@+id/ntp_toolbar"
+        android:background="@color/ntp_bg"
         android:layout_width="match_parent"
         android:layout_height="48dp"
         android:layout_gravity="bottom"
         android:orientation="horizontal" >
         <!-- Each button is a FrameLayout. Why? The TextView contains both text and a compound
              drawable icon. If the TextView is half the screen width, the icon will be at the left
              edge of the TextView even while the text is centered. To center the icon along with the
              text, we need to set the TextView's width to wrap_content; but since the button needs
              to be half the screen width, we wrap the TextView in a FrameLayout, whose width can
              expand as needed. -->
@@ skipping 30 matching lines @@
                 android:layout_height="match_parent"
                 android:layout_gravity="center_horizontal"
                 android:drawablePadding="8dp"
                 android:gravity="center_vertical"
                 android:text="@string/recent_tabs"
                 android:textSize="12sp"
                 android:textColor="#5a5a5a" />
         </FrameLayout>
     </org.chromium.chrome.browser.ntp.NewTabPageToolbar>
 </org.chromium.chrome.browser.ntp.NewTabPageView>