[Android] Make it possible to show Infobar in native pages (Second Try)

chrome/android/java/src/org/chromium/chrome/browser/ntp/IncognitoNewTabPage.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.ntp;
 
 import android.app.Activity;
 import android.graphics.Canvas;
 import android.view.LayoutInflater;
 import android.view.View;
@@ skipping 65 matching lines @@
      */
     @VisibleForTesting
     public boolean isLoadedForTests() {
         return mIsLoaded;
     }
 
     // NativePage overrides
 
     @Override
     public void destroy() {
-        assert getView().getParent() == null : "Destroy called before removed from window";
+        assert !getView().isAttachedToWindow() : "Destroy called before removed from window";
     }
 
     @Override
     public String getUrl() {
         return UrlConstants.NTP_URL;
     }
 
     @Override
     public String getTitle() {
         return mTitle;
@@ skipping 33 matching lines @@
     @Override
     public boolean shouldCaptureThumbnail() {
         return mIncognitoNewTabPageView.shouldCaptureThumbnail();
     }
 
     @Override
     public void captureThumbnail(Canvas canvas) {
         mIncognitoNewTabPageView.captureThumbnail(canvas);
     }
 }