Replace FTS in the history_service with a brute force text search.

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 c99457d636cee5990feaa1f9d362f64754b133b6..acc5525c55d1bf54b43472959436644f400b376b 100644
--- a/chrome/browser/history/history_types.h
+++ b/chrome/browser/history/history_types.h
@@ -294,6 +294,7 @@ class URLResult : public URLRow {
   // Constructor that create a URLResult from the specified URL and title match
   // positions from title_matches.
   URLResult(const GURL& url, const Snippet::MatchPositions& title_matches);
+  explicit URLResult(const URLRow& url_row);
   virtual ~URLResult();
 
   base::Time visit_time() const { return visit_time_; }
@@ -315,6 +316,8 @@ class URLResult : public URLRow {
 
   void SwapResult(URLResult* other);
 
+  static bool CompareVisitTime(const URLResult& lhs, const URLResult& rhs);
+
  private:
   friend class HistoryBackend;