Unify toolbar, NTP, and tab switcher text styles

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

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2016 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. -->
 
 <!--
     The TextView is wrapped in a FrameLayout so that the entire view can be centered and use a width
     of wrap_content. A RecyclerView does not support layout_gravity alignment. The width of the
     TextView must be wrap_content because otherwise clicks on the padding can activate its clickable
     span.
     See http://crbug.com/660083 for more details.
 -->
 <FrameLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:paddingTop="40dp"
     android:paddingBottom="18dp"
     android:paddingStart="16dp"
     android:paddingEnd="16dp">
     <TextView
         android:id="@+id/text"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_gravity="center"
         android:textColor="@color/snippets_text_color"
-        android:textSize="12sp"
-        android:textStyle="italic"/>
+        android:textSize="12sp"/>
 </FrameLayout>