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Previously fuchsia.media.cdm didn't support unencrypted blocks in secure
media streams. See fxb/38253 . To workaround that issue
FuchsiaSecureStreamDecryptor had to wait for a valid key_id. This issue
is fixed now: CDM API now supports ENCRYPTION_SCHEME_UNENCRYPTED, so the
workaround is no longer needed. Updated FuchsiaSecureStreamDecryptor to
use the new encryption scheme and removed the workaround.

Bug: 1012525
Change-Id: I079948a63c53d7fecdbd877452d1aaa1ec7477e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2020537Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Commit-Queue: Yuchen Liu <yucliu@chromium.org>
Commit-Queue: David Dorwin <ddorwin@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735170}