Revert of Align `clear-site-data` syntax with the spec.

Revert of Align `clear-site-data` syntax with the spec. (patchset #2 id:20001 of https://codereview.chromium.org/2929593002/ )

Reason for revert:
Despite passing all the bots, this apparently breaks `content_browsertests`: https://build.chromium.org/p/chromium.linux/buildstatus?builder=Linux%20Tests&number=57936. So, let's go fix that.

Original issue's description:
> Align `clear-site-data` syntax with the spec.
> 
> We've shifted from an explicit JSON dictionary to a list of quoted
> strings (that can be parsed as JSON for forward-compatibility). That is,
> rather than `Clear-Site-Data: { "types": [ "cookies", "cache" ] }`,
> we'll use `Clear-Site-Data: "cookies", "cache"` to mean the same thing.
> 
> Spec change in https://github.com/w3c/webappsec-clear-site-data/issues/27.
> 
> BUG=607897
> 
> Review-Url: https://codereview.chromium.org/2929593002
> Cr-Commit-Position: refs/heads/master@{#478585}
> Committed: https://chromium.googlesource.com/chromium/src/+/085b57ffe70b6cb90cd77b61585babcf59df3a95

TBR=msramek@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=607897
Review-Url: https://codereview.chromium.org/2933083002
Cr-Commit-Position: refs/heads/master@{#478594}
Committed: https://chromium.googlesource.com/chromium/src/+/b6ad2b157c987fe2d64e07990b83654ac9830a85

[Mike West, 2017-06-12 12:01:25]

The CQ bit was checked by mkwst@chromium.org

[Mike West, 2017-06-12 12:01:26]

Created Revert of Align `clear-site-data` syntax with the spec.

[commit-bot: I haz the power, 2017-06-12 12:01:32]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-06-12 12:01:54]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1497268885678290, "parent_rev":
"ec134f43c4436037b1f78723f1f7ed220d80aebe", "commit_rev":
"b6ad2b157c987fe2d64e07990b83654ac9830a85"}

[commit-bot: I haz the power, 2017-06-12 12:02:07]

Description was changed from

==========
Revert of Align `clear-site-data` syntax with the spec. (patchset #2 id:20001 of
https://codereview.chromium.org/2929593002/ )

Reason for revert:
Despite passing all the bots, this apparently breaks `content_browsertests`:
https://build.chromium.org/p/chromium.linux/buildstatus?builder=Linux%20Tests....
So, let's go fix that.

Original issue's description:
> Align `clear-site-data` syntax with the spec.
> 
> We've shifted from an explicit JSON dictionary to a list of quoted
> strings (that can be parsed as JSON for forward-compatibility). That is,
> rather than `Clear-Site-Data: { "types": [ "cookies", "cache" ] }`,
> we'll use `Clear-Site-Data: "cookies", "cache"` to mean the same thing.
> 
> Spec change in https://github.com/w3c/webappsec-clear-site-data/issues/27.
> 
> BUG=607897
> 
> Review-Url: https://codereview.chromium.org/2929593002
> Cr-Commit-Position: refs/heads/master@{#478585}
> Committed:
https://chromium.googlesource.com/chromium/src/+/085b57ffe70b6cb90cd77b61585b...

TBR=msramek@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=607897
==========

to

==========
Revert of Align `clear-site-data` syntax with the spec. (patchset #2 id:20001 of
https://codereview.chromium.org/2929593002/ )

Reason for revert:
Despite passing all the bots, this apparently breaks `content_browsertests`:
https://build.chromium.org/p/chromium.linux/buildstatus?builder=Linux%20Tests....
So, let's go fix that.

Original issue's description:
> Align `clear-site-data` syntax with the spec.
> 
> We've shifted from an explicit JSON dictionary to a list of quoted
> strings (that can be parsed as JSON for forward-compatibility). That is,
> rather than `Clear-Site-Data: { "types": [ "cookies", "cache" ] }`,
> we'll use `Clear-Site-Data: "cookies", "cache"` to mean the same thing.
> 
> Spec change in https://github.com/w3c/webappsec-clear-site-data/issues/27.
> 
> BUG=607897
> 
> Review-Url: https://codereview.chromium.org/2929593002
> Cr-Commit-Position: refs/heads/master@{#478585}
> Committed:
https://chromium.googlesource.com/chromium/src/+/085b57ffe70b6cb90cd77b61585b...

TBR=msramek@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=607897

Review-Url: https://codereview.chromium.org/2933083002
Cr-Commit-Position: refs/heads/master@{#478594}
Committed:
https://chromium.googlesource.com/chromium/src/+/b6ad2b157c987fe2d64e07990b83...
==========

[commit-bot: I haz the power, 2017-06-12 12:02:11]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/b6ad2b157c987fe2d64e07990b83...