[Suggestions] Remove TreeNode.getSuggestionAt() in favor of a visitor.

chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/StatusItem.java

 // Copyright 2016 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.cards;
 
 import android.content.Context;
 import android.support.annotation.StringRes;
 
 import org.chromium.chrome.R;
@@ skipping 27 matching lines @@
         @Override
         @StringRes
         public int getActionLabel() {
             return 0;
         }
 
         @Override
         public void performAction(Context context) {
             assert false;
         }
+
+        @Override
+        protected void visitOptionalItem(NodeVisitor visitor) {
+            visitor.visitNoSuggestionsItem();
+        }
     }
 
     @Override
     @ItemViewType
     protected int getItemViewType() {
         return ItemViewType.STATUS;
     }
 
     @Override
     protected void onBindViewHolder(NewTabPageViewHolder holder) {
         assert holder instanceof StatusCardViewHolder;
         ((StatusCardViewHolder) holder).onBindViewHolder(this);
     }
 }