There is already duplicate code getTransferDataFlavorsAsVector.
Maybe getTransferData can be also merged later.

Change-Id: Iaa1c16990c1f19757f04944bcd21f395f6b8f69b
Reviewed-on: https://gerrit.libreoffice.org/73301
Tested-by: Jenkins
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>