Merge java_staging/src into java/src.

chrome/android/java/src/org/chromium/chrome/browser/signin/SigninHelper.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.content.Context;
 import android.content.SharedPreferences;
 import android.os.AsyncTask;
@@ skipping 376 matching lines @@
                 .getBoolean(ACCOUNTS_CHANGED_PREFS_KEY, false)) {
             // Clear the value in prefs.
             PreferenceManager.getDefaultSharedPreferences(context)
                     .edit().putBoolean(ACCOUNTS_CHANGED_PREFS_KEY, false).apply();
             return true;
         } else {
             return false;
         }
     }
 }