Remove sampler-array-indexing.html suppression

It's been fixed by CL:1849452.

Bug: 985032
Change-Id: I0496e4fd0eb7ab523510d102b09612a82be9ff54
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1859634
Auto-Submit: Jiajie Hu <jiajie.hu@intel.com>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705598}

content/test/gpu/gpu_tests/test_expectations/webgl2_conformance_expectations.txt

@@ -53,9 +53,6 @@ crbug.com/953120 conformance/programs/program-handling.html [ Failure ]
 
 crbug.com/949249 [ passthrough ] conformance2/extensions/ovr_multiview2.html [ Failure ]
 
-# Marking a test as failing on all platforms.
-crbug.com/985032 conformance2/glsl3/sampler-array-indexing.html [ Failure ]
-
 # Failing new test
 crbug.com/874620 [ linux nvidia ] conformance2/glsl3/const-struct-from-array-as-function-parameter.html [ Failure ]
 crbug.com/874620 [ opengl win nvidia ] conformance2/glsl3/const-struct-from-array-as-function-parameter.html [ Failure ]