Introduce MultiWindowUtils#isLegacyMultiWindow()

chrome/android/java/src/org/chromium/chrome/browser/signin/SigninPromoScreen.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.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
@@ skipping 30 matching lines @@
     /**
      * Launches the signin promo if it needs to be displayed.
      * @param activity The parent activity.
      * @return Whether the signin promo is shown.
      */
     public static boolean launchSigninPromoIfNeeded(final Activity activity) {
         // The promo is displayed if Chrome is launched directly (i.e., not with the intent to
         // navigate to and view a URL on startup), the instance is part of the field trial,
         // and the promo has been marked to display.
         ChromePreferenceManager preferenceManager = ChromePreferenceManager.getInstance(activity);
-        if (MultiWindowUtils.getInstance().isMultiWindow(activity)) return false;
+        if (MultiWindowUtils.getInstance().isLegacyMultiWindow(activity)) return false;
         if (!preferenceManager.getShowSigninPromo()) return false;
         preferenceManager.setShowSigninPromo(false);
 
         String lastSyncName = PrefServiceBridge.getInstance().getSyncLastAccountName();
         if (SigninManager.getAndroidSigninPromoExperimentGroup() < 0
                 || ChromeSigninController.get(activity).isSignedIn()
                 || !TextUtils.isEmpty(lastSyncName)) {
             return false;
         }
 
@@ skipping 92 matching lines @@
 
         SigninPromoUma.recordAction(SigninPromoUma.SIGNIN_PROMO_ACCEPTED_WITH_ADVANCED);
         dismiss();
     }
 
     @Override
     public void onFailedToSetForcedAccount(String forcedAccountName) {
         assert false : "No forced accounts in SigninPromoScreen";
     }
 }