Use third_party/custom_tabs_client as the src for customtabs library

chrome/android/java/src/android/support/customtabs/CustomTabsCallback.java

Index: chrome/android/java/src/android/support/customtabs/CustomTabsCallback.java
diff --git a/chrome/android/java/src/android/support/customtabs/CustomTabsCallback.java b/chrome/android/java/src/android/support/customtabs/CustomTabsCallback.java
deleted file mode 100644
index 135aa0970ad207d4afc51a2a9d53752a463d8487..0000000000000000000000000000000000000000
--- a/chrome/android/java/src/android/support/customtabs/CustomTabsCallback.java
+++ /dev/null
@@ -1,51 +0,0 @@
-// 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.
-
-package android.support.customtabs;
-
-import android.os.Bundle;
-
-/**
- * A callback class for custom tabs client to get messages regarding events in their custom tabs.
- */
-public class CustomTabsCallback {
-    /**
-     * Sent when the tab has started loading a page.
-     */
-    public static final int NAVIGATION_STARTED = 1;
-
-    /**
-     * Sent when the tab has finished loading a page.
-     */
-    public static final int NAVIGATION_FINISHED = 2;
-
-    /**
-     * Sent when the tab couldn't finish loading due to a failure.
-     */
-    public static final int NAVIGATION_FAILED = 3;
-
-    /**
-     * Sent when loading was aborted by a user action before it finishes like clicking on a link
-     * or refreshing the page.
-     */
-    public static final int NAVIGATION_ABORTED = 4;
-
-    /**
-     * Sent when the tab becomes visible.
-     */
-    public static final int TAB_SHOWN = 5;
-
-    /**
-     * Sent when the tab becomes hidden.
-     */
-    public static final int TAB_HIDDEN = 6;
-
-    /**
-     * To be called when a navigation event happens.
-     *
-     * @param navigationEvent The code corresponding to the navigation event.
-     * @param extras Reserved for future use.
-     */
-    public void onNavigationEvent(int navigationEvent, Bundle extras) {}
-}