Improve single_line spinner layout

chrome/android/java/res/layout-sw360dp/preference_spinner_single_line.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2017 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. -->
 
 <!-- Layout used by SpinnerPreference if singleLine is set to true. -->
 
-<RelativeLayout
-    xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     style="@style/PreferenceLayout"
     android:layout_width="match_parent"
-    android:layout_height="wrap_content">
+    android:layout_height="wrap_content"
+    android:orientation="horizontal"
+    android:paddingEnd="8dp"
+    android:paddingTop="22dp">
 
     <TextView
         android:id="@+id/title"
         style="@style/PreferenceTitle"
         android:textColor="@color/google_grey_600"
         android:textAlignment="viewStart"
         android:layout_height="wrap_content"
-        android:layout_width="wrap_content"
-        android:layout_centerVertical="true"
-        android:layout_alignParentStart="true"
-        android:layout_toStartOf="@id/spinner" />
+        android:layout_width="0dp"
+        android:layout_weight="1" />
 
     <Spinner
         android:id="@+id/spinner"
         android:layout_height="wrap_content"
         android:layout_width="wrap_content"
-        android:layout_centerVertical="true"
-        android:layout_alignParentEnd="true" />
-</RelativeLayout>
+        android:gravity="end"/>
+</LinearLayout>