Temporarily skip WebGL name conflict test.

This test enforces non-spec behaviour. Temporarily disable while
the test is updated upstream.

Bug: angleproject:5499
Change-Id: I19b284ea0b27888f22628d5f8290f8605f17e6a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625568
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Auto-Submit: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842727}

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

@@ -207,6 +207,9 @@ crbug.com/1082533 [ mac intel ] conformance/textures/misc/texture-copying-and-de
 crbug.com/1136231 [ win ] conformance/extensions/s3tc-and-rgtc.html [ Failure ]
 crbug.com/1136231 [ linux ] conformance/extensions/s3tc-and-rgtc.html [ Failure ]
 
+# TODO(kbr): Lift this once upstream test is updated.
+crbug.com/angleproject/5499 conformance/glsl/misc/shaders-with-name-conflicts.html [ Skip ]
+
 # Skipping new tests
 crbug.com/angleproject/5038 conformance/extensions/ext-color-buffer-half-float.html [ Skip ]