Fixes redirects to external apps when navigating from PWA.

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.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.webapps;
 
 import android.content.Intent;
 import android.graphics.Bitmap;
 import android.graphics.Color;
 import android.graphics.drawable.Drawable;
@@ skipping 637 matching lines @@
         return null;
     }
 
     @Override
     protected TabDelegateFactory createTabDelegateFactory() {
         return new WebappDelegateFactory(this);
     }
 
     @Override
     protected TabDelegate createTabDelegate(boolean incognito) {
-        return new WebappTabDelegate(this, incognito);
+        return new WebappTabDelegate(incognito);
     }
 
     // We're temporarily disable CS on webapp since there are some issues. (http://crbug.com/471950)
     // TODO(changwan): re-enable it once the issues are resolved.
     @Override
     protected boolean isContextualSearchAllowed() {
         return false;
     }
 }