Update Pixel Expectations for Pixel_WebGLGreenTriangle_NoAA_Alpha

This is a follow up to https://chromium-review.googlesource.com/c/chromium/src/+/1808810
as apparently another of the WebGLGreenTriangle tests has begun demonstarting
the same flakes.

This marks it as Skip on Intel.

TBR=ynovikov@chromium.org
TEST=vulkan_pixel_skia_gold_test
Pixel_WebGLGreenTriangle_NoAA_Alpha

Bug: 1004840
Change-Id: Idaf0d683e0c31ce12600d545181d63b0bb16a580
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810823Reviewed-by: Jonathan Ross <jonross@chromium.org>
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697607}

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

@@ -192,6 +192,7 @@ crbug.com/1004837 [ linux skia-renderer use-vulkan intel ] Pixel_Canvas2DRedBox
 crbug.com/1004837 [ linux skia-renderer use-vulkan intel ] Pixel_Canvas2DTabSwitch [ Skip ]
 crbug.com/1004840 [ linux skia-renderer use-vulkan intel ] Pixel_WebGLGreenTriangle_AA_Alpha [ Skip ]
 crbug.com/1004840 [ linux skia-renderer use-vulkan intel ] Pixel_WebGLGreenTriangle_AA_NoAlpha [ Skip ]
+crbug.com/1004840 [ linux skia-renderer use-vulkan intel ] Pixel_WebGLGreenTriangle_NoAA_Alpha [ Skip ]
 crbug.com/1004840 [ linux skia-renderer use-vulkan intel ] Pixel_WebGLGreenTriangle_NoAA_NoAlpha [ Skip ]
 
 # Fails when the browser features SkiaRenderer & Vulkan are enabled on Android