WebGL: Suppress s3tc-and-rgtc on mac NVIDIA

TBR=ynovikov@chromium.org

Bug: chromium:1136231
Change-Id: Ib05d4463514e29bc4827b32a10ac6459011043b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2590039Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836729}

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

@@ -497,10 +497,10 @@ crbug.com/948218 [ mac debug nvidia-0xfe9 ] conformance/glsl/misc/shader-with-no
 crbug.com/1027776 [ mac nvidia-0xfe9 ] conformance/textures/canvas_sub_rectangle/tex-2d-rgb-rgb-unsigned_short_5_6_5.html [ RetryOnFailure ]
 crbug.com/1027776 [ mac nvidia-0xfe9 ] conformance/textures/canvas_sub_rectangle/tex-2d-rgba-rgba-unsigned_short_5_5_5_1.html [ Failure ]
 crbug.com/1027776 [ mac nvidia-0xfe9 ] conformance/textures/canvas_sub_rectangle/tex-2d-rgba-rgba-unsigned_short_4_4_4_4.html [ RetryOnFailure ]
+crbug.com/1136231 [ mac nvidia-0xfe9 ] conformance/extensions/s3tc-and-rgtc.html [ Failure ]
 
 # Mac / Passthrough command decoder
 crbug.com/angleproject/4986 [ mac passthrough ] conformance/textures/misc/gl-teximage.html [ Failure ]
-crbug.com/1153689 [ mac nvidia-0xfe9 passthrough ] conformance/extensions/s3tc-and-rgtc.html [ Failure ]
 
 # Mac / Passthrough command decoder / OpenGL
 crbug.com/989194 [ mac passthrough angle-opengl ] conformance/extensions/oes-texture-half-float.html [ Failure ]