Revert "Changed NavigationController access to through tab in Java code"

chrome/android/java/src/org/chromium/chrome/browser/RepostFormWarningDialog.java

 // Copyright 2013 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;
 
 import android.annotation.SuppressLint;
 import android.app.Dialog;
 import android.app.DialogFragment;
 import android.content.DialogInterface;
@@ skipping 56 matching lines @@
                 new AlertDialog.Builder(getActivity(), R.style.AlertDialogTheme)
                 .setMessage(R.string.http_post_warning);
 
         if (savedInstanceState == null) {
             assert mTab != null;
             builder.setNegativeButton(R.string.cancel,
                     new DialogInterface.OnClickListener() {
                         @Override
                         public void onClick(DialogInterface dialog, int id) {
                             if (!mTab.isInitialized()) return;
-                            mTab.getNavigationHandler().cancelPendingReload();
+                            mTab.getWebContents().getNavigationController().cancelPendingReload();
                         }
                     });
             builder.setPositiveButton(R.string.http_post_warning_resend,
                     new DialogInterface.OnClickListener() {
                         @Override
                         public void onClick(DialogInterface dialog, int id) {
                             if (!mTab.isInitialized()) return;
-                            mTab.getNavigationHandler().continuePendingReload();
+                            mTab.getWebContents().getNavigationController().continuePendingReload();
                         }
                     });
         }
 
         Dialog dialog = builder.create();
         setCurrentDialogForTesting(dialog);
 
         return dialog;
     }
 
@@ skipping 22 matching lines @@
     }
 
     /**
      * @return dialog currently being displayed.
      */
     @VisibleForTesting
     public static Dialog getCurrentDialogForTesting() {
         return sCurrentDialog;
     }
 }