Remove stale WebGL 1 expectations

Autogenerated CL from running:

//content/test/gpu/unexpected_pass_finder.py --project chrome-unexpected-pass-data --include-internal-builders --remove-stale-expectations --narrow-semi-stale-expectation-scope --num-samples 300 --suite webgl1_conformance --jobs 4 --disable-batching

Affected bugs for CL description:

R=rubber-stamper@appspot.gserviceaccount.com

Bug: 772651, 784817, 996344
Change-Id: Iae19e17928f5248a1baba28af106c8d9386b7aef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4846248
Auto-Submit: chrome-automated-expectation@chops-service-accounts.iam.gserviceaccount.com <chrome-automated-expectation@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1192975}

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

@@ -410,9 +410,6 @@ crbug.com/849572 [ angle-vulkan passthrough ] conformance/extensions/angle-insta
 crbug.com/849572 [ angle-swiftshader passthrough ] conformance/extensions/angle-instanced-arrays-out-of-bounds.html [ Failure ]
 crbug.com/849572 [ angle-opengles display-server-wayland linux passthrough ] conformance/extensions/angle-instanced-arrays-out-of-bounds.html [ Failure ]
 
-# Nvidia bugs fixed in latest driver
-# TODO(http://crbug.com/887241): Upgrade the drivers on the bots.
-crbug.com/772651 [ mac nvidia ] conformance/glsl/bugs/vector-scalar-arithmetic-inside-loop-complex.html [ Failure ]
 
 crbug.com/951628 [ passthrough ] conformance/rendering/blending.html [ Failure ]
 
@@ -510,8 +507,6 @@ crbug.com/1435021 [ mac amd-0x67ef angle-metal ] conformance/canvas/draw-webgl-t
 
 ## Mac Retina NVidia failures / flakes ##
 
-crbug.com/996344 [ mac nvidia-0xfe9 ] conformance/glsl/bugs/vector-scalar-arithmetic-inside-loop.html [ Failure ]
-crbug.com/784817 [ mac nvidia-0xfe9 ] conformance/glsl/bugs/init-array-with-loop.html [ Failure ]
 
 ## Mac / Passthrough command decoder / OpenGL / NVIDIA ##