[Android][Modularization] Clean up redundant IdentityServicesProvider

This CL cleans up redundant IdentityServicesProvider.

Bug: 1152718
Change-Id: Ie056721b377f1a8de747333eafbae7fcaf9daa3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2574844Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Commit-Queue: Alice Wang <aliceywang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834179}

chrome/android/chrome_java_sources.gni

@@ -1249,7 +1249,6 @@ chrome_java_sources = [
   "java/src/org/chromium/chrome/browser/signin/ConfirmSyncDataStateMachine.java",
   "java/src/org/chromium/chrome/browser/signin/ConfirmSyncDataStateMachineDelegate.java",
   "java/src/org/chromium/chrome/browser/signin/GoogleActivityController.java",
-  "java/src/org/chromium/chrome/browser/signin/IdentityServicesProvider.java",
   "java/src/org/chromium/chrome/browser/signin/PersonalizedSigninPromoView.java",
   "java/src/org/chromium/chrome/browser/signin/ProfileDataCache.java",
   "java/src/org/chromium/chrome/browser/signin/SignOutDialogFragment.java",

chrome/android/java/src/org/chromium/chrome/browser/signin/IdentityServicesProvider.java

-// Copyright 2018 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 org.chromium.chrome.browser.signin;
-
-/**
- * Provides access to sign-in related services that are profile-keyed on the native side. Java
- * equivalent of AccountTrackerServiceFactory and similar classes.
- *
- * TODO(https://crbug.com/1152718): Remove this class after cleaning up downstream dependencies in
- * //clank
- */
-@Deprecated
-public class IdentityServicesProvider
-        extends org.chromium.chrome.browser.signin.services.IdentityServicesProvider {}