clean up float-cast-overflow blacklist

These should be free of overflows now.

Bug: skia:7052
Change-Id: I05118fb8f565ffb0d973b6d93a8cd8d8e27f31a9
Reviewed-on: https://skia-review.googlesource.com/84561
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
3 files changed