Clean up old PrivacyPreferencesManager

This is a follow up to https://crrev.com/i/2756704.

Bug: 1047357
Change-Id: I850d2478e978d9dab188f9a2a0913ac30a2083c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2101716
Commit-Queue: Gang Wu <gangwu@chromium.org>
Auto-Submit: Natalie Chouinard <chouinard@chromium.org>
Reviewed-by: Gang Wu <gangwu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750248}

chrome/android/chrome_java_sources.gni

@@ -1420,7 +1420,6 @@ chrome_java_sources = [
   "java/src/org/chromium/chrome/browser/settings/homepage/HomepageMetricsEnums.java",
   "java/src/org/chromium/chrome/browser/settings/homepage/HomepageSettings.java",
   "java/src/org/chromium/chrome/browser/settings/homepage/RadioButtonGroupHomepagePreference.java",
-  "java/src/org/chromium/chrome/browser/settings/privacy/PrivacyPreferencesManager.java",
   "java/src/org/chromium/chrome/browser/share/LensUtils.java",
   "java/src/org/chromium/chrome/browser/share/OptionalShareTargetsManager.java",
   "java/src/org/chromium/chrome/browser/share/ShareActivity.java",

chrome/android/java/src/org/chromium/chrome/browser/settings/privacy/PrivacyPreferencesManager.java

-// Copyright 2020 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.settings.privacy;
-
-/**
- * TODO(chouinard): Remove this temporary wrapper class after downstream references are migrated.
- */
-public class PrivacyPreferencesManager {
-    public static org.chromium.chrome.browser.privacy.settings.PrivacyPreferencesManager
-    getInstance() {
-        return org.chromium.chrome.browser.privacy.settings.PrivacyPreferencesManager.getInstance();
-    }
-}