This converts the tabmodalprompt binding to a class, to be constructed along side with the element
by TabModalPromptBox.
TabModalPromptBox will keep the instances in a map and pass it to the callers, instead of the element.
The tests and callers can access the class instance by passing the element reference to the map.
Differential Revision: https://phabricator.services.mozilla.com/D15505
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rename : toolkit/components/prompts/content/tabprompts.xml => toolkit/components/prompts/content/tabprompts.jsm
extra : moz-landing-system : lando
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
