Update WebGL 2 conformance test expectation.

Removes the suppression for:
  conformance2/textures/image_bitmap_from_image/
    tex-3d-r16f-red-float.html

Bug: 679695
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ifec56d01e4cf903f827a09a1aa176275912c8f0c
Reviewed-on: https://chromium-review.googlesource.com/1010022Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550493}

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

@@ -870,8 +870,6 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
                ['linux'], bug=627525)
     self.Fail('conformance2/glsl3/vector-dynamic-indexing-nv-driver-bug.html',
         ['linux'], bug=483282)
-    self.Fail('conformance2/textures/image_bitmap_from_image/' +
-              'tex-3d-r16f-red-float.html', ['linux'], bug=679695)
 
     # Linux Multi-vendor failures.
     self.Skip('deqp/data/gles3/shaders/qualification_order.html',