Delete unused policy code

Some Java code in policy components are kept due to internal code base
references. Those references are removed hence those code can be clean
up now.

Bug: 1127469
Change-Id: I36021a4e73c988ccc391e89a28815224a98bba06
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414890
Auto-Submit: Owen Min <zmin@chromium.org>
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808167}

chrome/android/java/src/org/chromium/chrome/browser/AppHooks.java

@@ -262,13 +262,6 @@ public abstract class AppHooks {
                 new AppRestrictionsProvider(ContextUtils.getApplicationContext()));
     }
 
-    // TODO(zmin): Delete once the internal code is migrated.
-    public void registerPolicyProviders(
-            org.chromium.policy.CombinedPolicyProvider combinedProvider) {
-        combinedProvider.registerProvider(
-                new AppRestrictionsProvider(ContextUtils.getApplicationContext()));
-    }
-
     /**
      * TODO(crbug.com/1102812) : Remove this method after updating the downstream to use the new
      * method {@link getOfflinePagesCctAllowlist} instead.

components/policy/android/BUILD.gn

@@ -27,9 +27,6 @@ android_library("policy_java") {
   annotation_processor_deps = [ "//base/android/jni_generator:jni_processor" ]
 
   sources = _jni_sources + [
-              "java/src/org/chromium/policy/AppRestrictionsProvider.java",
-              "java/src/org/chromium/policy/CombinedPolicyProvider.java",
-              "java/src/org/chromium/policy/PolicyProvider.java",
               "java/src/org/chromium/components/policy/AbstractAppRestrictionsProvider.java",
               "java/src/org/chromium/components/policy/AppRestrictionsProvider.java",
               "java/src/org/chromium/components/policy/PolicyProvider.java",

components/policy/android/java/src/org/chromium/policy/AppRestrictionsProvider.java

-// 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 org.chromium.policy;
-
-import android.content.Context;
-
-/**
- * Concrete app restriction provider, that uses the default android mechanism to retrieve the
- * restrictions.
- * TODO(zmin): Delete once the internal code is migrated.
- */
-public class AppRestrictionsProvider
-        extends org.chromium.components.policy.AppRestrictionsProvider {
-    public AppRestrictionsProvider(Context context) {
-        super(context);
-    }
-}

components/policy/android/java/src/org/chromium/policy/CombinedPolicyProvider.java

-// 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 org.chromium.policy;
-
-/**
- * Reads enterprise policies from one or more policy providers and plumbs them through to the policy
- * subsystem.
- *
- * TODO(zmin): Delete once the internal code is migrated.
- */
-public class CombinedPolicyProvider extends org.chromium.components.policy.CombinedPolicyProvider {}

components/policy/android/java/src/org/chromium/policy/PolicyProvider.java

-// 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 org.chromium.policy;
-
-/**
- * Base class for Policy providers.
- * TODO(zmin): Delete once the internal code is migrated.
- */
-public abstract class PolicyProvider extends org.chromium.components.policy.PolicyProvider {}