Fix missing thumbnails for new profile with TopSites.

chrome/browser/history/thumbnail_database.h

Index: chrome/browser/history/thumbnail_database.h
diff --git a/chrome/browser/history/thumbnail_database.h b/chrome/browser/history/thumbnail_database.h
index 4312a064856f8fe401dd7d735413bddc9a7ffdb9..81d498c54c7e9bdafe27ad5260df7e663fcdf029 100644
--- a/chrome/browser/history/thumbnail_database.h
+++ b/chrome/browser/history/thumbnail_database.h
@@ -182,6 +182,10 @@ class ThumbnailDatabase {
   // This can be NULL if there are no indexers registered to receive indexing
   // data from us.
   const HistoryPublisher* history_publisher_;
+
+  // True if migration to TopSites has been done and the thumbnails
+  // table should not be used.
+  bool use_top_sites_;
 };
 
 }  // namespace history