Settings: Add a new Enable Protected Content checkbox on all platforms

Settings: Add a new Enable Protected Content checkbox on all platforms

This CL adds a new checkbox for the new WebKit preference to enable
HTML5 Encrypted Media / DRM.

BUG=690077
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2682653005
Cr-Commit-Position: refs/heads/master@{#449105}
(cherry picked from commit 239f8c5202eb155ff3bc22dbc1db77c0753497fa)

Review-Url: https://codereview.chromium.org/2686173002 .
Cr-Commit-Position: refs/branch-heads/2987@{#415}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/157d48c67f0547e452a75d693abd8e9edaa7c6c8

[tommycli, 2017-02-09 20:24:51]

Description was changed from

==========
Settings: Add a new Enable Protected Content checkbox on all platforms

This CL adds a new checkbox for the new WebKit preference to enable
HTML5 Encrypted Media / DRM.

BUG=690077
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2682653005
Cr-Commit-Position: refs/heads/master@{#449105}
(cherry picked from commit 239f8c5202eb155ff3bc22dbc1db77c0753497fa)
==========

to

==========
Settings: Add a new Enable Protected Content checkbox on all platforms

This CL adds a new checkbox for the new WebKit preference to enable
HTML5 Encrypted Media / DRM.

BUG=690077
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2682653005
Cr-Commit-Position: refs/heads/master@{#449105}
(cherry picked from commit 239f8c5202eb155ff3bc22dbc1db77c0753497fa)

Review-Url: https://codereview.chromium.org/2686173002 .
Cr-Commit-Position: refs/branch-heads/2987@{#415}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/157d48c67f0547e452a75d693abd...
==========

[tommycli, 2017-02-09 20:24:53]

Committed patchset #1 (id:1) manually as
157d48c67f0547e452a75d693abd8e9edaa7c6c8.