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Eliminate commented-out code (#45726)

This appears to have been inadvertently added in #37497 (333c961).

The code in question already exists in `_PlatformViewGestureMixin`, which
`PlatformViewRenderBox` (where it was added) mixes in.
C
Chris Bracken committed
dc49fa2140678ce1d3283af06f5859cae496640a
Parent: f87c510
Committed by GitHub <noreply@github.com> on 11/27/2019, 10:50:15 PM