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Currently there's a special logic in mime_util_internal.cc that
encrypted VP9 profiles 1/2/3 are generally not supported. In this CL,
this logic is removed, so that each key system has the opportunity to
declare whether VP9 profiles 1/2/3 are supported.

To do so, EME_CODEC_LEGACY_VP9 is replaced by EME_CODEC_VP9_PROFILE0,
which is used for both legacy VP9 ("vp9" and "vp9.0") and new multi-part
VP9 profile 0 ("vp09.00.*"). EME_CODEC_VP9_PROFILES123 is added for
VP9 profiles 1/2/3.

Since External Clear Key (ECK) key system supports all codecs, now VP9
profiles 1/2/3 are supported by ECK. Browser tests are updated to
reflect this.

Bug: 707127
Test: Updated test cases
Change-Id: Ia6cdabde0edc4680d0bfa0f8a74a7b8e4151d4e1
Reviewed-on: https://chromium-review.googlesource.com/c/1274893Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Sergey Volk <servolk@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599861}