Bug 1447929 - Fix a few interface/concrete smart pointers in Places. r=standard8

MozReview-Commit-ID: IEoPxZseoyw

--HG--
extra : rebase_source : 9f4e25a2174b4b179bb45807da4263ca225970bf

toolkit/components/places/SQLFunctions.cpp

@@ -576,7 +576,7 @@ namespace places {
 
     // Fetch the page stats from the database.
     {
-      RefPtr<mozIStorageStatement> getPageInfo = DB->GetStatement(
+      nsCOMPtr<mozIStorageStatement> getPageInfo = DB->GetStatement(
         "SELECT typed, visit_count, foreign_count, "
                "(substr(url, 0, 7) = 'place:') "
         "FROM moz_places "

toolkit/components/places/nsNavHistory.cpp

@@ -2602,7 +2602,7 @@ NS_IMETHODIMP
 nsNavHistory::GetDBConnection(mozIStorageConnection **_DBConnection)
 {
   NS_ENSURE_ARG_POINTER(_DBConnection);
-  RefPtr<mozIStorageConnection> connection = mDB->MainConn();
+  nsCOMPtr<mozIStorageConnection> connection = mDB->MainConn();
   connection.forget(_DBConnection);
 
   return NS_OK;