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Remove revision from GPU PixelTestPage

Removes the golden revision property from PixelTestPage, as it has not
been used since switching the GPU pixel tests over to Skia Gold.

Bug: 1008524
Change-Id: I5a88285b147fbc14b794a2a35434bf00e4300a79
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1834831
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702099}