Address NewApi and other Android lint warnings in src/chrome.

chrome/android/java/res/layout/fre_choose_account.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.firstrun.AccountFirstRunView
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/fre_account_layout"
     android:layout_width="match_parent"
@@ skipping 75 matching lines @@
         android:layout_gravity="bottom"
         android:layout_marginBottom="56dp" />
 
     <LinearLayout
         android:id="@+id/button_bar"
         android:layout_width="match_parent"
         android:layout_height="56dp"
         android:layout_gravity="bottom"
         android:orientation="horizontal" >
 
+        <!--suppress ButtonStyle -->
         <Button
             android:id="@+id/negative_button"
             android:layout_width="0dp"
             android:layout_height="match_parent"
             android:layout_weight="1"
             android:background="?attr/listChoiceBackgroundIndicator"
             android:gravity="start|center_vertical"
             android:textDirection="locale"
             android:padding="16dp"
             android:text="@string/fre_skip_text"
             android:textAllCaps="true"
             android:textColor="@color/light_normal_color"
             android:textSize="@dimen/fre_button_text_size" />
 
+        <!--suppress ButtonStyle -->
         <Button
             android:id="@+id/positive_button"
             android:layout_width="0dp"
             android:layout_height="match_parent"
             android:layout_weight="1"
             android:background="?attr/listChoiceBackgroundIndicator"
             android:gravity="end|center_vertical"
             android:textDirection="locale"
             android:padding="16dp"
             android:text="@string/choose_account_sign_in"
             android:textAllCaps="true"
             android:textColor="@color/light_active_color"
             android:textSize="@dimen/fre_button_text_size" />
     </LinearLayout>
 
 </org.chromium.chrome.browser.firstrun.AccountFirstRunView>