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Currently, the expected.txt for this layout test is different comparing
the virtual/gpu with platform/win-xp/virtual/gpu. Also, This test is marked
as failure under platform/win-xp/virtual/gpu/, and the reason is that the
actual output is the same as virtual/gpu. So this CL removes the expected.txt
under platform/win-xp/virtual/gpu and the failure line under TestExpectations.

BUG=568678

Review URL: https://codereview.chromium.org/1551793002

Cr-Commit-Position: refs/heads/master@{#367087}