Add mime type information to the download database

chrome/browser/history/download_database.h

Index: chrome/browser/history/download_database.h
diff --git a/chrome/browser/history/download_database.h b/chrome/browser/history/download_database.h
index 36f27f28283d2f84c92080e276805862d0830adc..c16e704aafc2be05c511d17edc8590c28304de9e 100644
--- a/chrome/browser/history/download_database.h
+++ b/chrome/browser/history/download_database.h
@@ -52,6 +52,9 @@ class DownloadDatabase {
   // Returns the database for the functions in this interface.
   virtual sql::Connection& GetDB() = 0;
 
+  // Returns true if able to successfully add mime types to the downloads table.
+  bool MigrateMimeType();

[asanka, 2013/12/20 17:58:16]

Nit: HistoryDatabase ends up inheriting from DownloadDatabase, URLDatabase,
VisitDatabase etc It'll be clearer if this was called MigrateDownloadMimeTypes()
or somesuch.

+
   // Returns true if able to successfully rewrite the invalid values for the
   // |state| field from 3 to 4. Returns false if there was an error fixing the
   // database. See http://crbug.com/140687