Remove legacy API support from Flutter

All uses of these APIs have been removed / updated.
This still can't land until all Flutter fixes:

  https://github.com/flutter/engine/commit/c092e1475ad473d30fe740bc307bfd08b54a84fc

have landed in Fuchsia:

  https://fuchsia.googlesource.com/topaz/+/master/manifest/flutter

Change-Id: I3d188e3594751617f3f232fe7323428c822d13e1
Reviewed-on: https://skia-review.googlesource.com/117780
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed