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The upload uses CopySubTextureCHROMIUM which is compatible with
immutable textures, as it does not change the texture size. It used
to use CopyTextureCHROMIUM, which is not compatible, and had a unit
test describing this. But in reality this has changed, so always make
the resource immutible, and stop checking for that when recycling.

R=piman@chromium.org

Bug: 768976
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ia9a31769fcc6c513291b6e67be4dea07d1c02168
Reviewed-on: https://chromium-review.googlesource.com/685742Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504481}