Revert of ChildAccountService[Java] delegates everything to native side.

chrome/android/java/src/org/chromium/chrome/browser/services/AndroidEduAndChildAccountHelper.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.chrome.browser.services;
 
 import android.content.Context;
 
 import org.chromium.base.Log;
 import org.chromium.chrome.browser.ChromeApplication;
@@ skipping 24 matching lines @@
         return mHasChildAccount;
     }
 
     /**
      * Starts fetching the Android EDU and child accounts information.
      * Calls onParametersReady() once the information is fetched.
      * @param appContext The application context.
      */
     public void start(Context appContext) {
         Log.d(TAG, "before checking child and EDU");
-        ChildAccountService.checkHasChildAccount(appContext, this);
+        ChildAccountService.getInstance(appContext).checkHasChildAccount(this);
         ((ChromeApplication) appContext).checkIsAndroidEduDevice(this);
         // TODO(aruslan): Should we start a watchdog to kill if Child/Edu stuff takes too long?
         Log.d(TAG, "returning from start");
     }
 
     private void checkDone() {
         if (mIsAndroidEduDevice == null || mHasChildAccount == null) return;
         Log.d(TAG, "parameters are ready");
         onParametersReady();
     }
 
     // AndroidEdu.OwnerCheckCallback:
     @Override
     public void onSchoolCheckDone(boolean isAndroidEduDevice) {
         Log.d(TAG, "onSchoolCheckDone");
         mIsAndroidEduDevice = isAndroidEduDevice;
         checkDone();
     }
 
     // ChildAccountManager.HasChildAccountCallback:
     @Override
     public void onChildAccountChecked(boolean hasChildAccount) {
         Log.d(TAG, "onChildAccountChecked");
         mHasChildAccount = hasChildAccount;
         checkDone();
     }
 }