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Right now TestOptionsProvider tries to intercept transfer cache usage
for images, which invalidates a lot of the assumptions made by the
calling code. Instead change this to create and store transfer cache
entries similar to production behaviour.

Also remove some asserts from TransferCacheTestHelper. Since this is
used by fuzzers, it should behave more like production code.

R=enne@chromium.org
BUG=839304

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ifd0f25dd4ef13872245717b85ef8b9bd5df3c1d0
Reviewed-on: https://chromium-review.googlesource.com/1043526Reviewed-by: enne <enne@chromium.org>
Commit-Queue: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556131}