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CDM_9 support has been shipped in Chomium for multiple releases. All new CDMs
should use CDM_9 and above. Hence removing support for CDM_8.

only cover CDM_9 and CDM_10.

Bug: 737296
Test: Removing support of old interface support. Currently our tests
Change-Id: I22facd6dc6e18933a295d3aece7ba2de1369cb79
Reviewed-on: https://chromium-review.googlesource.com/1015640Reviewed-by: Frank Liberato <liberato@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551494}