Revert to using system AlertDialog.Builder.

chrome/android/java/res/layout/add_to_homescreen_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.
 -->
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:gravity="start"
     style="@style/AlertDialogContent" >
     <ImageView
         android:id="@+id/icon"
         android:layout_width="32dp"
         android:layout_height="32dp"
         android:layout_marginTop="10dp"
         android:contentDescription="@null"
         android:visibility="gone" />
     <ProgressBar
         android:id="@+id/spinny"
         android:layout_width="32dp"
         android:layout_height="32dp"
         android:layout_marginTop="10dp" />
-    <EditText android:id="@+id/text"
+    <org.chromium.chrome.browser.widget.AlertDialogEditText
+        android:id="@+id/text"
         android:inputType="text"
         android:layout_width="match_parent"
         android:layout_height="32dp"
         android:textSize="18sp"
         android:singleLine="true"
         android:paddingTop="0dp"
         android:layout_marginTop="10dp"
         android:layout_marginStart="48dp" />
 </FrameLayout>