Revert of Supervised user web restrictions content provider

chrome/browser/android/preferences/pref_service_bridge.cc

 // Copyright 2014 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.
 
 #include "chrome/browser/android/preferences/pref_service_bridge.h"
 
 #include <jni.h>
 
 #include "base/android/build_info.h"
 #include "base/android/jni_android.h"
@@ skipping 935 matching lines @@
     ContentSettingsType content_type) {
   JNIEnv* env = AttachCurrentThread();
   base::android::ScopedJavaLocalRef<jstring> android_permission =
       Java_PrefServiceBridge_getAndroidPermissionForContentSetting(
           env, content_type);
   if (android_permission.is_null())
     return std::string();
 
   return ConvertJavaStringToUTF8(android_permission);
 }
-
-static void SetSupervisedUserId(JNIEnv* env,
-                                const JavaParamRef<jobject>& obj,
-                                const JavaParamRef<jstring>& pref) {
-  GetPrefService()->SetString(prefs::kSupervisedUserId,
-                              ConvertJavaStringToUTF8(env, pref));
-}