Bug 852021 - add getText* at caret offset mochitest, r=tbsaunde
MSVC wants a cast-to-integer-type before dividing by a bool that should promote to int.  Sigh.  Followup to bug 851237, r=windows-redness

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extra : rebase_source : cf4ca438261d5bdf115a21d40f1ad4164ccbeaea