Clear browsing data ui fixes

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. -->
 
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     style="@style/PreferenceLayout"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:orientation="horizontal"
-    android:paddingEnd="8dp"
-    android:paddingTop="22dp">
+    android:paddingEnd="@dimen/pref_spinner_padding_end"
+    android:paddingTop="12dp"
+    android:paddingBottom="6dp">
 
     <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="0dp"
         android:layout_weight="1" />
 
     <Spinner
         android:id="@+id/spinner"
         android:layout_height="wrap_content"
         android:layout_width="wrap_content"
-        android:gravity="end"/>
+        android:gravity="end"
+        android:paddingTop="12dp"
+        android:paddingBottom="12dp"/>
 </LinearLayout>