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Close() is confusing as people might relate to MediaKeySession::close().
Also, the current names are not consistent with what we use in other
parts of the stack, making code search harder.

This CL renames the methods to make it consistent with what use
everywhere else.

Tbr: dcheng@chromium.org
Change-Id: Ia9dd8c17ac11b9276efc0f4133f6002dea2a524c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2277339Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786342}