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The new name is shorter and better reflects what the class does:
providing the MediaCrypto object.

Bug: 821114
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: I5226a8280a1342fb47a0847755b82a8be8ed52e4
Reviewed-on: https://chromium-review.googlesource.com/959698Reviewed-by: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542916}