Suppress ANGLE-Vulkan-Win test.

This regresses with a recent ANGLE CL. May be a driver bug:

conformance/textures/misc/default-texture.html

See bug for more details.

Bug: angleproject:4569
Tbr: ynovikov@chromium.org
Change-Id: Ic78513f6997e6e45b36d9e78132bfc67c071ef2d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2149625Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759000}

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

@@ -267,6 +267,8 @@ crbug.com/angleproject/2915 [ win nvidia vulkan passthrough ] conformance/textur
 crbug.com/angleproject/2930 [ win nvidia vulkan passthrough ] conformance/textures/misc/texture-size-cube-maps.html [ Failure ]
 crbug.com/angleproject/3481 [ win nvidia vulkan passthrough ] conformance/textures/misc/texture-sub-image-cube-maps.html [ Failure ]
 crbug.com/angleproject/2926 [ win nvidia vulkan passthrough ] deqp/data/gles2/shaders/conversions.html [ Failure ]
+crbug.com/angleproject/4569 [ win nvidia vulkan passthrough ] conformance/textures/misc/default-texture.html [ Failure ]
+
 # Flaky since crbug.com/1017162
 crbug.com/1017162 [ win nvidia vulkan passthrough ] conformance/extensions/angle-instanced-arrays.html [ Failure ]
 crbug.com/1017162 [ win nvidia vulkan passthrough ] conformance/ogles/GL/* [ Failure ]