Revert of Android: Remove GetApplicationContext part 2

components/signin/core/browser/android/java/src/org/chromium/components/signin/ChromeSigninController.java

 // Copyright 2013 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.components.signin;
 
 import android.accounts.Account;
+import android.content.Context;
 
 import org.chromium.base.ContextUtils;
 
 /**
  * Caches the signed-in username in the app prefs.
  */
 public class ChromeSigninController {
     public static final String TAG = "ChromeSigninController";
 
     // Used by ChromeBackupAgent and for testing.
     public static final String SIGNED_IN_ACCOUNT_KEY = "google.services.username";
 
     private static final Object LOCK = new Object();
 
     private static ChromeSigninController sChromeSigninController;
 
-    private ChromeSigninController() {}
+    private final Context mApplicationContext;
+
+    private ChromeSigninController(Context context) {
+        mApplicationContext = context.getApplicationContext();
+    }
 
     /**
      * A factory method for the ChromeSigninController.
      *
+     * @param context the ApplicationContext is retrieved from the context used as an argument.
      * @return a singleton instance of the ChromeSigninController
      */
-    public static ChromeSigninController get() {
+    public static ChromeSigninController get(Context context) {
         synchronized (LOCK) {
             if (sChromeSigninController == null) {
-                sChromeSigninController = new ChromeSigninController();
+                sChromeSigninController = new ChromeSigninController(context);
             }
         }
         return sChromeSigninController;
     }
 
     public Account getSignedInUser() {
         String syncAccountName = getSignedInAccountName();
         if (syncAccountName == null) {
             return null;
         }
         return AccountManagerHelper.createAccountFromName(syncAccountName);
     }
 
     public boolean isSignedIn() {
         return getSignedInAccountName() != null;
     }
 
     public void setSignedInAccountName(String accountName) {
         ContextUtils.getAppSharedPreferences()
                 .edit()
                 .putString(SIGNED_IN_ACCOUNT_KEY, accountName)
                 .apply();
     }
 
     public String getSignedInAccountName() {
         return ContextUtils.getAppSharedPreferences().getString(SIGNED_IN_ACCOUNT_KEY, null);
     }
 }