Change chooser action button to use grey and blue background

chrome/android/java/res/layout/item_chooser_dialog.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.
  -->
 
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:chrome="http://schemas.android.com/apk/res-auto"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:orientation="vertical"
     android:paddingBottom="8dp"
     android:paddingTop="20dp" >
 
     <!-- The title at the top. -->
     <org.chromium.ui.widget.TextViewWithClickableSpans
         android:id="@+id/dialog_title"
         android:layout_width="wrap_content"
@@ skipping 42 matching lines @@
     <org.chromium.ui.widget.TextViewWithClickableSpans
         android:id="@+id/status"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginTop="12dp"
         android:paddingStart="16dp"
         android:paddingEnd="16dp"
         android:textSize="14sp" />
 
     <!-- Button row. -->
-    <Button
+    <org.chromium.ui.widget.ButtonCompat
         android:id="@+id/positive"
-        style="?android:attr/buttonBarButtonStyle"
         android:layout_height="wrap_content"
         android:layout_width="wrap_content"
         android:layout_gravity="end"
-        android:paddingTop="12dp"
-        android:paddingEnd="16dp" />
+        android:layout_marginTop="12dp"
+        android:layout_marginEnd="12dp"
+        android:paddingStart="16dp"
+        android:paddingEnd="16dp"
+        android:textAllCaps="true"
+        android:textColor="#fff"
+        chrome:buttonColor="@color/pref_accent_color" />
 </LinearLayout>