Remove some failure entry in gpu pixel test expectations

content/test/gpu/gpu_tests/pixel_expectations.py

Index: content/test/gpu/gpu_tests/pixel_expectations.py
diff --git a/content/test/gpu/gpu_tests/pixel_expectations.py b/content/test/gpu/gpu_tests/pixel_expectations.py
index d93ae5799da1a5b27b7f683904851b2be6c95b9f..fd4956fa4e21cb33566e859439d0b9d66224e8a7 100644
--- a/content/test/gpu/gpu_tests/pixel_expectations.py
+++ b/content/test/gpu/gpu_tests/pixel_expectations.py
@@ -31,12 +31,5 @@ class PixelExpectations(GpuTestExpectations):
     self.Fail('Pixel.CSSFilterEffects', ['mac'], bug=581526)
     self.Fail('Pixel.CSSFilterEffects.NoOverlays', ['mac'], bug=581526)
 
-    # TODO(xidachen) check / generate reference images
-    self.Fail('Pixel.OffscreenCanvasWebGLGreenBox', bug=563852)
-    self.Fail('Pixel.OffscreenCanvasWebGLRedBoxWorker', bug=563852)
-
-    self.Fail('Pixel.OffscreenCanvasTransferToImageBitmap', bug=563852)
-    self.Fail('Pixel.OffscreenCanvasTransferToImageBitmapWorker', bug=563852)
-
     # TODO(kbr): flakily timing out on this configuration.
     self.Flaky('*', ['linux', 'intel', 'debug'], bug=648369)