Remove suppression for WebGL test conformance/glsl/bugs/character-set.html

Bug is fixed and the test is passing on bots.

TBR=kbr@chromium.org

Bug: 1108588
Change-Id: Ied77c504ddb297444c9d23b1b28bb3e5bb8c247a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404951Reviewed-by: Shrek Shao <shrekshao@google.com>
Commit-Queue: Shrek Shao <shrekshao@google.com>
Cr-Commit-Position: refs/heads/master@{#806014}

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

@@ -69,7 +69,6 @@ crbug.com/891861 [ android no-passthrough ] WebglExtension_WEBGL_multi_draw_inst
 # ========================
 
 # Failing new updated tests
-crbug.com/1108588 conformance/glsl/bugs/character-set.html [ Failure ]
 crbug.com/1108044 conformance2/renderbuffers/readbuffer.html [ Failure ]
 crbug.com/1108086 [ no-passthrough ] conformance2/renderbuffers/framebuffer-object-attachment.html [ Failure ]
 crbug.com/angleproject/4807 [ win passthrough ] conformance2/glsl3/switch-case.html [ Failure ]

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

@@ -125,7 +125,6 @@ crbug.com/angleproject/4846 [ mac metal passthrough ] WebglExtension_WEBGL_draw_
 # Fails on all platforms
 
 crbug.com/1110449 [ linux passthrough ] conformance/misc/type-conversion-test.html [ Failure ]
-crbug.com/1108588 conformance/glsl/bugs/character-set.html [ Failure ]
 crbug.com/1081973 conformance/buffers/buffer-data-and-buffer-sub-data.html [ Failure ]
 crbug.com/1082533 [ mac intel ] conformance/textures/misc/texture-copying-and-deletion.html [ Failure ]
 crbug.com/1082533 [ win vulkan passthrough ] conformance/textures/misc/texture-copying-and-deletion.html [ Failure ]