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Recent versions of Widevine support 'cbcs' encrypted files, so add a query
test to verify that it is supported. As well, on systems where Widevine is
not component updated, indicate that the bundled Widevine does support
'cbcs' decryption.

BUG=835009
TEST=new browser_tests pass

Change-Id: Icc4294cca4ac9ba97c2a22816217c57e2262d30a
Reviewed-on: https://chromium-review.googlesource.com/1101405Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567433}