Revert "Suppress WebGL test conformance/textures/webgl_canvas/tex-2d-rgb-rgb-unsigned_byte.html"

This reverts commit 99314be8.

Reason for revert: culprit found. Findit incorrectly reports flakiness.

Original change's description:
> Suppress WebGL test conformance/textures/webgl_canvas/tex-2d-rgb-rgb-unsigned_byte.html
>
> Suppress conformance/textures/webgl_canvas/tex-2d-rgb-rgb-unsigned_byte.html on
> chromeos amd as RetryOnFailure
>
> TBR=kbr@chromium.org
>
> Bug: 1161258
> Change-Id: I9f9bcd2084c37fe87f422878dca63ce5d2e82647
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601185
> Reviewed-by: Shrek Shao <shrekshao@google.com>
> Commit-Queue: Shrek Shao <shrekshao@google.com>
> Cr-Commit-Position: refs/heads/master@{#838975}

TBR=kbr@chromium.org,shrekshao@google.com,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

Change-Id: Idbc2e4dc446544125c6f36d1e502bfc47e9e42b2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1161258
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601543Reviewed-by: Shrek Shao <shrekshao@google.com>
Commit-Queue: Shrek Shao <shrekshao@google.com>
Cr-Commit-Position: refs/heads/master@{#838999}

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

@@ -817,7 +817,6 @@ crbug.com/1145830 [ chromeos chromeos-board-amd64-generic ] conformance/textures
 # ChromeOS: AMD
 crbug.com/995652 [ chromeos amd ] conformance/uniforms/out-of-bounds-uniform-array-access.html [ Skip ]
 crbug.com/1042897 [ chromeos amd ] conformance/textures/webgl_canvas/tex-2d-rgba-rgba-unsigned_byte.html [ RetryOnFailure ]
-crbug.com/1161258 [ chromeos amd ] conformance/textures/webgl_canvas/tex-2d-rgb-rgb-unsigned_byte.html [ RetryOnFailure ]
 
 # Texture compression is only expected to be available on desktop GPUs.
 crbug.com/1080360 [ chromeos chromeos-board-kevin ] WebglExtension_EXT_texture_compression_bptc [ Skip ]