Extract BookmarksFileImporter from Firefox2Importer.

chrome/browser/history/history_types.h

Index: chrome/browser/history/history_types.h
diff --git a/chrome/browser/history/history_types.h b/chrome/browser/history/history_types.h
index a78a8bcccd83a57f756286601a1031d7959fb882..3a6ed68c8de4fd38e7c40e94faf607a6bd691055 100644
--- a/chrome/browser/history/history_types.h
+++ b/chrome/browser/history/history_types.h
@@ -801,21 +801,6 @@ struct FaviconBitmap {
   gfx::Size pixel_size;
 };
 
-// Used by the importer to set favicons for 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;
-};
-
 // Abbreviated information about a visit.
 struct BriefVisitInfo {
   URLID url_id;