Enable VP9 in MP4 by default

Enable VP9 in MP4 by default

Removed command line switch --enable-vp9-in-mp4.

Bug: 726759
Change-Id: Ie6bf267ec69536a1ccbe00f558aa9fe0ebb50dde
Reviewed-on: https://chromium-review.googlesource.com/511165
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>;
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>;
Commit-Queue: Kongqun Yang <kqyang@chromium.org>;
Cr-Original-Commit-Position: refs/heads/master@{#477349}
Review-Url: https://codereview.chromium.org/2928873002 .
Cr-Commit-Position: refs/branch-heads/3112@{#239}
Cr-Branched-From: b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
Committed: https://chromium.googlesource.com/chromium/src/+/1f1ddcecbf7c77407034739ed5371dcd7dfc8c2e

[chcunningham, 2017-06-07 22:31:46]

Description was changed from

==========
Enable VP9 in MP4 by default

Removed command line switch --enable-vp9-in-mp4.

Bug: 726759
Change-Id: Ie6bf267ec69536a1ccbe00f558aa9fe0ebb50dde
Reviewed-on: https://chromium-review.googlesource.com/511165
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Kongqun Yang <kqyang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#477349}
(cherry picked from commit 7a3b1574bb3a12078de8008771103163e0317652)
==========

to

==========
Enable VP9 in MP4 by default

Removed command line switch --enable-vp9-in-mp4.

Bug: 726759
Change-Id: Ie6bf267ec69536a1ccbe00f558aa9fe0ebb50dde
Reviewed-on: https://chromium-review.googlesource.com/511165
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Kongqun Yang <kqyang@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#477349}
Review-Url: https://codereview.chromium.org/2928873002 .
Cr-Commit-Position: refs/branch-heads/3112@{#239}
Cr-Branched-From:
b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
Committed:
https://chromium.googlesource.com/chromium/src/+/1f1ddcecbf7c77407034739ed537...
==========

[chcunningham, 2017-06-07 22:31:48]

Committed patchset #1 (id:1) manually as
1f1ddcecbf7c77407034739ed5371dcd7dfc8c2e (tree was closed).