Unsupress video tests after rebaseline.

TBR=zmo@chromium.org

BUG=749748

Cq-Include-Trybots: luci.chromium.try:linux_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I0d19ab8893767bf6752c3c67813e4d0354c5e5fe
Reviewed-on: https://chromium-review.googlesource.com/963070
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543681}

content/test/gpu/gpu_tests/pixel_expectations.py

@@ -105,10 +105,6 @@ class PixelExpectations(GpuTestExpectations):
     self.Fail('Pixel_WebGL_PremultipliedAlpha_False',
               ['android', 'nvidia'], bug=791733)
 
-    # Temporary supression for rebaseline
-    self.Fail('Pixel_DirectComposition_Video_MP4', ['win'], bug=749748)
-    self.Fail('Pixel_DirectComposition_Video_VP9', ['win'], bug=749748)
-
     # TODO(zmo): temporarily suppress these two tests until new
     # reference images with new names are generated.
     self.Fail('Pixel_Canvas2DRedBox_NoGpuProcess',