Enable Pixel_OffscreenCanvasTransfer*StyleResize

Would like to see if the tests are no longer flaky after
https://chromium-review.googlesource.com/1010466.

TBR=kbr@chromium.org

Bug: 735228,735171
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: Ic2bdeb13f52f4fff4f94cc7f7ee46f503c7646f3
Reviewed-on: https://chromium-review.googlesource.com/1012985
Commit-Queue: Olivia Lai <xlai@chromium.org>
Reviewed-by: Justin Novosad <junov@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551140}

content/test/gpu/gpu_tests/pixel_expectations.py

@@ -71,10 +71,6 @@ class PixelExpectations(GpuTestExpectations):
     self.Flaky('Pixel_OffscreenCanvas2DResizeOnWorker',
         ['win10', ('intel', 0x1912)], bug=690663)
 
-    self.Flaky('Pixel_OffscreenCanvasTransferBeforeStyleResize',
-              ['mac', 'linux', 'win', 'android'], bug=735228)
-    self.Flaky('Pixel_OffscreenCanvasTransferAfterStyleResize',
-              ['mac', 'linux', 'win', 'android'], bug=735171)
     self.Flaky('Pixel_OffscreenCanvasTransferToImageBitmap',
               ['linux', 'win', 'android'], bug=807742)