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Previously FuchsiaVideoDecoder was was destroying decryptor when
re-initializing. This approach wasn't working well because the buffer
collection shared between decryptor and decoder is being torn down when
decryptor is destroyed, which causes the decoder to fail as well. To
avoid this issue FuchsiaVideoDecoder now reuses the decryptor after
re-initialization.

Bug: 1003529
Change-Id: Ie90d4e5f9d4bbe5d96dafcfc69d19f314080c05c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1819945
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699874}