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Remove the deprecated function that uses default InitParams. Add the
params in the remaining callsites and set |single_process| correctly for
tests. video_decode_accelerator_unittest.cc sets |single_process| to
false, as the test runs with Ozone DRM on CrOS devices.

Bug: 620934, 700142
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Iaac92d25eba7c9e052c250e84fdef2f46ecea7ee
Reviewed-on: https://chromium-review.googlesource.com/667720
Commit-Queue: kylechar <kylechar@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#502731}