Re-enable AF matrix tests

Previously supressed due to timeout issues, but this has been
mitigated in the CTS. AF multiplication, which uses the same
mitigation, isn't currently supressed, but more prone to timeouts, so
the mitigation is working.

Bug: 42251105
Change-Id: I9469ec9f5c413bdefa174b0cfde717c3a545ee31
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/187202
Commit-Queue: James Price <jrprice@google.com>
Reviewed-by: James Price <jrprice@google.com>
Auto-Submit: Ryan Harrison <rharrison@chromium.org>
diff --git a/webgpu-cts/expectations.txt b/webgpu-cts/expectations.txt
index 1520e7d..e29fae4 100644
--- a/webgpu-cts/expectations.txt
+++ b/webgpu-cts/expectations.txt
@@ -196,14 +196,6 @@
 crbug.com/dawn/0000 [ dawn-backend-validation no-asan no-clang-coverage release-x64 target-cpu-64 webgpu-adapter-default win10 ] webgpu:web_platform,copyToTexture,ImageData:copy_subrect_from_ImageData:* [ Failure ]
 
 ################################################################################
-# Abstract matrix by matrix operations
-# Skipped because they are very slow and cause general timeouts
-# KEEP
-################################################################################
-crbug.com/tint/2051 webgpu:shader,execution,expression,binary,af_matrix_addition:* [ Skip ]
-crbug.com/tint/2051 webgpu:shader,execution,expression,binary,af_matrix_subtraction:* [ Skip ]
-
-################################################################################
 # Interpolated fragment_output_mask failing on Android Arm (Pixel 6)
 # KEEP
 ################################################################################