Fix a few minor whitespace issues.

chrome/android/java/res/layout/number_roll_view.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. -->
 
 <org.chromium.chrome.browser.widget.NumberRollView
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/selection_mode_number"
     android:layout_width="wrap_content"
     android:layout_height="match_parent"
     android:visibility="gone" >
 
     <TextView
         android:id="@+id/up"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_gravity="center_vertical"
         android:singleLine="true"
         android:textColor="@android:color/white"
         android:textSize="20sp" />
 
     <TextView
         android:id="@+id/down"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_gravity="center_vertical"
         android:singleLine="true"
         android:textColor="@android:color/white"
         android:textSize="20sp" />
-</org.chromium.chrome.browser.widget.NumberRollView>
+</org.chromium.chrome.browser.widget.NumberRollView>