Lift hopefully-obsolete WebGL flake suppressions for Mac

TBR: kbr@chromium.org
Bug: 663601, 679058
Change-Id: Ib861dc6a8e40cc2038359a04113db757fb8d210e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446594Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813349}

content/test/gpu/gpu_tests/test_expectations/webgl2_conformance_expectations.txt

@@ -521,11 +521,6 @@ crbug.com/636648 [ mac amd ] deqp/functional/gles3/shaderindexing/mat_01.html [
 crbug.com/644360 [ mac amd ] deqp/functional/gles3/shaderindexing/mat_02.html [ RetryOnFailure ]
 crbug.com/659871 [ mac amd ] deqp/functional/gles3/shaderindexing/tmp.html [ RetryOnFailure ]
 
-# These seem to be provoking intermittent GPU process crashes on
-# the MacBook Pros with AMD GPUs.
-crbug.com/663601 [ mac amd ] deqp/functional/gles3/texturefiltering/* [ RetryOnFailure ]
-crbug.com/663601 [ mac amd ] deqp/functional/gles3/textureshadow/* [ RetryOnFailure ]
-crbug.com/679058 [ mac amd ] deqp/functional/gles3/texturespecification/teximage2d_unpack_params.html [ RetryOnFailure ]
 crbug.com/642822 [ mac amd ] conformance2/rendering/clipping-wide-points.html [ Failure ]
 
 crbug.com/1005593 [ mac amd ] deqp/functional/gles3/shaderstruct.html [ RetryOnFailure ]