Remove TextDatabase from the history service.

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 acc5525c55d1bf54b43472959436644f400b376b..ea93140e710c0cc4c16df7e179e7780d77e367d0 100644
--- a/chrome/browser/history/history_types.h
+++ b/chrome/browser/history/history_types.h
@@ -247,13 +247,6 @@ class VisitRow {
   // If 0, the segment id is null in the table.
   SegmentID segment_id;
 
-  // True when this visit has indexed data for it. We try to keep this in sync
-  // with the full text index: when we add or remove things from there, we will
-  // update the visit table as well. However, that file could get deleted, or
-  // out of sync in various ways, so this flag should be false when things
-  // change.
-  bool is_indexed;
-
   // Record how much time a user has this visit starting from the user
   // opened this visit to the user closed or ended this visit.
   // This includes both active and inactive time as long as