GetMostRecentKeywordSearchTermsRequest 1122 chrome/browser/history/history_backend.cc     scoped_refptr<GetMostRecentKeywordSearchTermsRequest> request,
GetMostRecentKeywordSearchTermsRequest  298 chrome/browser/history/history_backend.h       scoped_refptr<GetMostRecentKeywordSearchTermsRequest> request,
GetMostRecentKeywordSearchTermsRequest  374 chrome/browser/history/history_service.cc                   new history::GetMostRecentKeywordSearchTermsRequest(callback),