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We previously created a SkSurface for the sole purpose of allocating
a GrBackendTexture and keeping it alive. This was a minor misuse of
the Skia API. This CL uses a proper API that Skia just added.
It allows us to remove a workaround for Nexus 5X.

Change-Id: Icbd6c7a86914eab080b7673a87201ca4e0c55345
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1627631
Commit-Queue: Jonathan Backer <backer@chromium.org>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Cr-Commit-Position: refs/heads/master@{#663073}