Revert 212459 "Remove TextDatabase from the history service."

trunk/src/chrome/browser/history/expire_history_backend.h

Index: trunk/src/chrome/browser/history/expire_history_backend.h
===================================================================
--- trunk/src/chrome/browser/history/expire_history_backend.h	(revision 212472)
+++ trunk/src/chrome/browser/history/expire_history_backend.h	(working copy)
@@ -25,6 +25,7 @@
 class ArchivedDatabase;
 class HistoryDatabase;
 struct HistoryDetails;
+class TextDatabaseManager;
 class ThumbnailDatabase;
 
 // Delegate used to broadcast notifications to the main thread.
@@ -75,7 +76,8 @@
   // Completes initialization by setting the databases that this class will use.
   void SetDatabases(HistoryDatabase* main_db,
                     ArchivedDatabase* archived_db,
-                    ThumbnailDatabase* thumb_db);
+                    ThumbnailDatabase* thumb_db,
+                    TextDatabaseManager* text_db);
 
   // Begins periodic expiration of history older than the given threshold. This
   // will continue until the object is deleted.
@@ -126,6 +128,9 @@
   // Deletes the visit-related stuff for all the visits in the given list, and
   // adds the rows for unique URLs affected to the affected_urls list in
   // the dependencies structure.
+  //
+  // Deleted information is the visits themselves and the full-text index
+  // entries corresponding to them.
   void DeleteVisitRelatedInfo(const VisitVector& visits,
                               DeleteDependencies* dependencies);
 
@@ -133,7 +138,8 @@
   void ArchiveVisits(const VisitVector& visits);
 
   // Finds or deletes dependency information for the given URL. Information that
-  // is specific to this URL (URL row, thumbnails, etc.) is deleted.
+  // is specific to this URL (URL row, thumbnails, full text indexed stuff,
+  // etc.) is deleted.
   //
   // This does not affect the visits! This is used for expiration as well as
   // deleting from the UI, and they handle visits differently.
@@ -234,6 +240,12 @@
   // and deletes items. For example, URLs with no visits.
   void ParanoidExpireHistory();
 
+  // Schedules a call to DoExpireHistoryIndexFiles.
+  void ScheduleExpireHistoryIndexFiles();
+
+  // Deletes old history index files.
+  void DoExpireHistoryIndexFiles();
+
   // Returns the BookmarkService, blocking until it is loaded. This may return
   // NULL.
   BookmarkService* GetBookmarkService();
@@ -257,6 +269,7 @@
   HistoryDatabase* main_db_;       // Main history database.
   ArchivedDatabase* archived_db_;  // Old history.
   ThumbnailDatabase* thumb_db_;    // Thumbnails and favicons.
+  TextDatabaseManager* text_db_;   // Full text index.
 
   // Used to generate runnable methods to do timers on this class. They will be
   // automatically canceled when this class is deleted.