In 4.4 WebCore/bridge/GlobalHistory.h was used, but in trunk this has been removed.
*** Bug 20193 has been marked as a duplicate of this bug. ***
as far as i can tell, this is a pure virtual method to be re-implemented in client application side and also called from them. so i would not expect it to be called by WebCore. Instead, suppose a client app is using a sqlite db to store its history content. this method will be implemented to search for a given history entry on that specific store syste. In an internal browser of ours, for example, we make use of both this and "addHistoryEntry" methods by re-implementing it in application side for our needs. i am not if this bug will valid.
This is fixed since r43052