Remove flaky Win/Vulkan/NV WebGL suppression.

The drivers have been upgraded. Try running the test suites again
to see if the device lost problems have gone away.

Bug: 917046
Change-Id: I8a8b92e5cdb0f26f7b6f502cbd99c52308767ecd
Tbr: kbr@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/1407089Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622124}

content/test/gpu/gpu_tests/webgl_conformance_expectations.py

@@ -123,10 +123,6 @@ class WebGLConformanceExpectations(GpuTestExpectations):
         'in-parameter-passed-as-inout-argument-and-global.html',
         ['nvidia'], bug=792210)
 
-    # Random crashes and device lost can occur with the NVIDIA Vulkan driver.
-    # TODO(jmadill): Lift this once drivers upgraded. http://crbug.com/887241
-    self.Flaky('*', ['win', 'nvidia', 'passthrough', 'vulkan'], bug=917046)
-
     # This test needs to be rewritten to measure its expected
     # performance; it's currently too flaky even on release bots.
     self.Skip('conformance/rendering/texture-switch-performance.html',