Note that this patch also replaces legacy VK_* with KEY_*, and replaces
synthesizeKey() for inputting some characters with sendString() because
it's better and clearer what it does and it sets shiftKey state properly.
MozReview-Commit-ID: De4enbjux3T
--HG--
extra : rebase_source : 2296b84bff8e22f01eeb48cd8614fac5db11136a