Extract BookmarksFileImporter from Firefox2Importer.

chrome/browser/favicon/imported_favicon_usage.h

+// 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.
+
+#ifndef CHROME_BROWSER_FAVICON_IMPORTED_FAVICON_USAGE_H_
+#define CHROME_BROWSER_FAVICON_IMPORTED_FAVICON_USAGE_H_
+
+#include <set>
+#include <vector>
+
+#include "googleurl/src/gurl.h"
+
+// Used to correlate favicons to imported bookmarks.
+struct ImportedFaviconUsage {
+  ImportedFaviconUsage();
+  ~ImportedFaviconUsage();
+
+  // The URL of the favicon.
+  GURL favicon_url;
+
+  // The raw png-encoded data.
+  std::vector<unsigned char> png_data;
+
+  // The list of URLs using this favicon.
+  std::set<GURL> urls;
+};
+
+#endif  // CHROME_BROWSER_FAVICON_IMPORTED_FAVICON_USAGE_H_