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This was public because GpuImageDecodeCache used skia to get the decode,
which is not required anymore. Going forward we should eliminate this
within PaintImage itself.

R=vmpstr@chromium.org

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: Id34affc108d4f13f6aae53c19da61a884823b5b9
Reviewed-on: https://chromium-review.googlesource.com/779768Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519958}