Merge of "Replace deprecated calls to GetMetadata in Zine provider."

Merge of "Replace deprecated calls to GetMetadata in Zine provider."

This is a merge of https://codereview.chromium.org/2643453002 into M57
(branch 2987). This CL is needed in order to merge
https://codereview.chromium.org/2669533002 into the same branch.

Original description:
Use GetMetadataList instead of GetMetadata, which is now deprecated.

BUG=672012, 685245
Review-Url: https://codereview.chromium.org/2643453002
Cr-Commit-Position: refs/heads/master@{#445113}
(cherry picked from commit e11c34fb2c29ea47003a20391f0c7222b14b1e13)

Review-Url: https://codereview.chromium.org/2677983002 .
Cr-Commit-Position: refs/branch-heads/2987@{#319}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/5b35ede154158d7ce3e9f25c11f6a96e85b2ea29

[vitaliii, 2017-02-06 12:12:04]

Description was changed from

==========
Merge of "Replace deprecated calls to GetMetadata in Zine provider."

This is a merge of https://codereview.chromium.org/2643453002 into M57
(branch 2987). This CL is needed in order to merge
https://codereview.chromium.org/2669533002 into the same branch.

Original description:
Use GetMetadataList instead of GetMetadata, which is now deprecated.

BUG=672012,685245

Review-Url: https://codereview.chromium.org/2643453002
Cr-Commit-Position: refs/heads/master@{#445113}
(cherry picked from commit e11c34fb2c29ea47003a20391f0c7222b14b1e13)
==========

to

==========
Merge of "Replace deprecated calls to GetMetadata in Zine provider."

This is a merge of https://codereview.chromium.org/2643453002 into M57
(branch 2987). This CL is needed in order to merge
https://codereview.chromium.org/2669533002 into the same branch.

Original description:
Use GetMetadataList instead of GetMetadata, which is now deprecated.

BUG=672012,685245

Review-Url: https://codereview.chromium.org/2643453002
Cr-Commit-Position: refs/heads/master@{#445113}
(cherry picked from commit e11c34fb2c29ea47003a20391f0c7222b14b1e13)

Review-Url: https://codereview.chromium.org/2677983002 .
Cr-Commit-Position: refs/branch-heads/2987@{#319}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/5b35ede154158d7ce3e9f25c11f6...
==========

[vitaliii, 2017-02-06 12:12:05]

Committed patchset #1 (id:1) manually as
5b35ede154158d7ce3e9f25c11f6a96e85b2ea29.