Remove temporary failure expectations for Pixel_OffscreenCanvasTransferToImageBitmap etc.

Bug: 627683
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;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Ib5e777a993b64f2efaf1b4f0952e506f8e3010a0
TBR: kbr@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/1289389Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600895}

content/test/gpu/gpu_tests/pixel_expectations.py

@@ -131,11 +131,6 @@ class PixelExpectations(GpuTestExpectations):
     self.Fail('Pixel_OffscreenCanvasWebGLPaintAfterResize',
               ['android', 'nvidia'], bug=868596)
 
-    # TODO(wangxianzhu): temporarily suppress these two tests until new
-    # reference images are generated.
-    self.Fail('Pixel_OffscreenCanvasTransferToImageBitmap', bug=627683)
-    self.Fail('Pixel_OffscreenCanvasTransferToImageBitmapWorker', bug=627683)
-
     # Fails on Nexus 5, 6 and 6P
     self.Fail('Pixel_BackgroundImage',
         ['android', ('qualcomm', 'Adreno (TM) 330')], bug=883500)