Ramanpreet Nara 010e3302b8 Refactor ScrollResponder Mixin removal
Summary: In D13307775, ScrollView was changed into a `React.Component` subclass. The solution needed a few touchups, so I added them in this diff.

Reviewed By: TheSavior

Differential Revision: D13404191

fbshipit-source-id: cba2ddab1fb92a2cbb91b59ac9ae5b5d51d91eb8
2018-12-26 10:34:41 -08:00
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