Re-enable CSS3DBlueBox pixel test.

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 d886f8d962f6bd410aff082a6dad7eb9e1db6c40..71769cc395f88327ff80757f5688223230e01c32 100644
--- a/content/test/gpu/gpu_tests/pixel_expectations.py
+++ b/content/test/gpu/gpu_tests/pixel_expectations.py
@@ -29,11 +29,7 @@ class PixelExpectations(GpuTestExpectations):
         ['android'], bug=521588)
 
     # TODO(ccameron) fix these on Mac Retina
-    # self.Fail('Pixel_CSS3DBlueBox', ['mac'], bug=533690)
-
-    # TODO(jvanverth) remove once rebaselines are complete
-    # restore Mac-only fail above when removed
-    self.Fail('Pixel_CSS3DBlueBox', bug=673752)
+    self.Fail('Pixel_CSS3DBlueBox', ['mac'], bug=533690)
 
     # TODO(vmiura) check / generate reference images for Android devices
     self.Fail('Pixel_SolidColorBackground', ['mac', 'android'], bug=624256)