Suppress conformance/textures/misc/texture-corner-case-videos.html

as flaky on ANGLE Android.
Skip suppression was lifted in
https://chromium-review.googlesource.com/c/chromium/src/+/1355239,
so this can be simplified now.

TBR=kbr

Bug: 979444
No-try: true
Change-Id: I1f27637be5da63442dead3a1cc723c3f4c49b5ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1693173Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675817}

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

@@ -62,10 +62,8 @@ crbug.com/867718 [ win d3d9 ] WebglExtension_EXT_disjoint_timer_query [ Failure
 # ========================
 # Fails on all platforms
 
-crbug.com/979444 [ win ] conformance/textures/misc/texture-corner-case-videos.html [ RetryOnFailure ]
-crbug.com/979444 [ linux ] conformance/textures/misc/texture-corner-case-videos.html [ RetryOnFailure ]
-crbug.com/979444 [ mac ] conformance/textures/misc/texture-corner-case-videos.html [ RetryOnFailure ]
-crbug.com/979444 [ android no-angle ] conformance/textures/misc/texture-corner-case-videos.html [ RetryOnFailure ]
+# TODO(ynovikov): re-add suppressions below once this is removed.
+crbug.com/979444 conformance/textures/misc/texture-corner-case-videos.html [ RetryOnFailure ]
 
 # Need to implement new error semantics
 # https://github.com/KhronosGroup/WebGL/pull/2607