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This patch removes at raster decode flag, which is only used in tests.

R=enne@chromium.org, chrishtr@chromium.org

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I1f8f81856c12c8f521a6e57268d35430dc3135c7
Reviewed-on: https://chromium-review.googlesource.com/848302Reviewed-by: enne <enne@chromium.org>
Commit-Queue: vmpstr <vmpstr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526606}