Revert of Android: Remove GetApplicationContext part 2

chrome/android/javatests/src/org/chromium/chrome/browser/signin/SigninHelperTest.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.signin;
 
 import android.accounts.Account;
 import android.support.test.InstrumentationRegistry;
 import android.support.test.filters.SmallTest;
 
@@ skipping 132 matching lines @@
         mEventChecker.insertRenameEvent("C", "D");
         mEventChecker.insertRenameEvent("D", "A"); // Looped.
         Account account = AccountManagerHelper.createAccountFromName("D");
         AccountHolder accountHolder = AccountHolder.builder(account).build();
         mAccountManager.addAccountHolderExplicitly(accountHolder);
         SigninHelper.updateAccountRenameData(mContext, mEventChecker);
         Assert.assertEquals("D", getNewSignedInAccountName());
     }
 
     private void setSignedInAccountName(String account) {
-        ChromeSigninController.get().setSignedInAccountName(account);
+        ChromeSigninController.get(mContext).setSignedInAccountName(account);
     }
 
     private String getSignedInAccountName() {
-        return ChromeSigninController.get().getSignedInAccountName();
+        return ChromeSigninController.get(mContext).getSignedInAccountName();
     }
 
     private String getNewSignedInAccountName() {
         return SigninHelper.getNewSignedInAccountName(mContext);
     }
 }