Eliminate the archived history database and clean up related code.

chrome/browser/history/url_database.h

Index: chrome/browser/history/url_database.h
diff --git a/chrome/browser/history/url_database.h b/chrome/browser/history/url_database.h
index be933aaf069ddf28dde45a159674e73a32cbca72..55a8870e7ec8c9d5f5926acc16c73c99ea0952c0 100644
--- a/chrome/browser/history/url_database.h
+++ b/chrome/browser/history/url_database.h
@@ -24,7 +24,7 @@ class VisitDatabase;  // For friend statement.
 // Encapsulates an SQL database that holds URL info.  This is a subset of the
 // full history data.  We split this class' functionality out from the larger
 // HistoryDatabase class to support maintaining separate databases of URLs with
-// different capabilities (for example, in-memory, or archived).
+// different capabilities (for example, the in-memory database).
 //
 // This is refcounted to support calling InvokeLater() with some of its methods
 // (necessary to maintain ordering of DB operations).
@@ -111,10 +111,7 @@ class URLDatabase {
 
   // Ends the mass-deleting by replacing the original URL table with the
   // temporary one created in CreateTemporaryURLTable. Returns true on success.
-  //
-  // This function does not create the supplimentary indices. It is virtual so

[engedy, 2014/04/16 18:08:10]

Note: Removing this as there is no CreateSupplimentaryURLIndices() anymore.
Also, this function is not actually overriden by the main DB.

-  // that the main history database can provide this additional behavior.
-  virtual bool CommitTemporaryURLTable();
+  bool CommitTemporaryURLTable();
 
   // Enumeration ---------------------------------------------------------------