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This is a follow on to: https://codereview.chromium.org/2559213002/ (Add suppression for GPU Pixel test in preparation for Skia CL)

The Skia CL https://skia-review.googlesource.com/c/5747/ (Add antialiasing to SkDropShadowImageFilter's shadow draw) finally rolled into Chrome at 437566 on 12/9/2016.

BUG=672527
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2573803002
Cr-Commit-Position: refs/heads/master@{#439472}