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With the new Widevine CDM, support for encrypted VP9 profile 2 has
been added. So change the supports_vp9_profile2 capability to true
for ChromeOS. Other OSes will get the VP9 profile 2 support from
the Widevine CDM manifest.

This changes also updates the browser tests expected result to SUCCESS
for VP9 profile 2.

Bug: 707128
Change-Id: Idfedd94c726afa22b538870eb103b1fdb6d51209
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866011
Commit-Queue: Haoming Chen <hmchen@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708098}