Add new NTP layout with snippet cards and hide it behind a flag

chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetHeaderItemViewHolder.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetHeaderItemViewHolder.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetHeaderItemViewHolder.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetHeaderItemViewHolder.java
deleted file mode 100644
index 05eda5aad16868f435b934728e4db5d06ae2ddba..0000000000000000000000000000000000000000
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetHeaderItemViewHolder.java
+++ /dev/null
@@ -1,46 +0,0 @@
-// 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.snippets;
-
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
-import android.widget.TextView;
-
-import org.chromium.chrome.R;
-import org.chromium.chrome.browser.ntp.snippets.SnippetsManager.SnippetHeader;
-import org.chromium.chrome.browser.ntp.snippets.SnippetsManager.SnippetListItem;
-
-/**
- * A class that represents the view for a header of a group of card snippets.
- */
-class SnippetHeaderItemViewHolder extends SnippetListItemViewHolder {
-    private TextView mHeaderTextView;
-
-    public SnippetHeaderItemViewHolder(View view, SnippetsManager manager) {
-        super(view, manager);
-        mHeaderTextView = (TextView) view.findViewById(R.id.snippets_list_header);
-    }
-
-    /**
-     * Creates the TextView object for displaying the header for a group of snippets
-     *
-     * @param parent The parent view for the header
-     * @return a TextView object for displaying a header for a group of snippets
-     */
-    public static View createView(ViewGroup parent) {
-        return LayoutInflater.from(parent.getContext())
-                .inflate(R.layout.new_tab_page_snippets_header, parent, false);
-    }
-
-    @Override
-    public void onBindViewHolder(SnippetListItem snippetItem) {
-        SnippetHeader item = (SnippetHeader) snippetItem;
-
-        String headerText = mHeaderTextView.getContext().getString(
-                R.string.snippets_header, item.mRecommendationBasis);
-        mHeaderTextView.setText(headerText);
-    }
-}