Revert of Catch up the spec update in CSS Rhythmic Sizing

Revert of Catch up the spec update in CSS Rhythmic Sizing (patchset #7 id:120001 of https://codereview.chromium.org/2704343003/ )

Reason for revert:
Broke https://build.chromium.org/p/chromium/builders/Linux%20x64

See https://build.chromium.org/p/chromium/builders/Linux%20x64/builds/34559 and https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium%2FLinux_x64%2F34559%2F%2B%2Frecipes%2Fsteps%2Fcompile_confirm_no-op%2F0%2Fstdout

Original issue's description:
> Catch up the spec update in CSS Rhythmic Sizing
> 
> This patch catches up spec changes in CSS Rhythmic Sizing[1]. In
> particular:
> 1. The property name was changed to 'line-height-step'.
> 2. The value syntax was changed to single <length>.
> 3. The baseline position feature was removed.
> 
> Tests in csswg-test were updated[2] and imported to fail. All of them
> pass in this patch.
> 
> The feature is still behind the flag.
> 
> [1] https://drafts.csswg.org/css-rhythm/
> [2] https://github.com/w3c/csswg-test/commit/50a861a451a1fe9cc80044568c257212729779fa
> 
> BUG=586413
> 
> Review-Url: https://codereview.chromium.org/2704343003
> Cr-Commit-Position: refs/heads/master@{#455008}
> Committed: https://chromium.googlesource.com/chromium/src/+/2344921f94b85be9884ed847d9a041a5e2575946

TBR=meade@chromium.org,sashab@chromium.org,eae@chromium.org,kojii@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=586413
Review-Url: https://codereview.chromium.org/2737673003
Cr-Commit-Position: refs/heads/master@{#455020}
Committed: https://chromium.googlesource.com/chromium/src/+/3204d73f00beb67fb13aaf079be34ae10f7b6749

[sclittle, 2017-03-07 01:27:06]

The CQ bit was checked by sclittle@chromium.org

[sclittle, 2017-03-07 01:27:08]

Created Revert of Catch up the spec update in CSS Rhythmic Sizing

[commit-bot: I haz the power, 2017-03-07 01:27:56]

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, 2017-03-07 01:29:43]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1488850026039450, "parent_rev":
"cac6c252b97e579353f83be2d68253fba17c2524", "commit_rev":
"3204d73f00beb67fb13aaf079be34ae10f7b6749"}

[commit-bot: I haz the power, 2017-03-07 01:30:20]

Description was changed from

==========
Revert of Catch up the spec update in CSS Rhythmic Sizing (patchset #7 id:120001
of https://codereview.chromium.org/2704343003/ )

Reason for revert:
Broke https://build.chromium.org/p/chromium/builders/Linux%20x64

See https://build.chromium.org/p/chromium/builders/Linux%20x64/builds/34559 and
https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium%2FLinux_x64%2F3...

Original issue's description:
> Catch up the spec update in CSS Rhythmic Sizing
> 
> This patch catches up spec changes in CSS Rhythmic Sizing[1]. In
> particular:
> 1. The property name was changed to 'line-height-step'.
> 2. The value syntax was changed to single <length>.
> 3. The baseline position feature was removed.
> 
> Tests in csswg-test were updated[2] and imported to fail. All of them
> pass in this patch.
> 
> The feature is still behind the flag.
> 
> [1] https://drafts.csswg.org/css-rhythm/
> [2]
https://github.com/w3c/csswg-test/commit/50a861a451a1fe9cc80044568c2572127297...
> 
> BUG=586413
> 
> Review-Url: https://codereview.chromium.org/2704343003
> Cr-Commit-Position: refs/heads/master@{#455008}
> Committed:
https://chromium.googlesource.com/chromium/src/+/2344921f94b85be9884ed847d9a0...

TBR=meade@chromium.org,sashab@chromium.org,eae@chromium.org,kojii@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=586413
==========

to

==========
Revert of Catch up the spec update in CSS Rhythmic Sizing (patchset #7 id:120001
of https://codereview.chromium.org/2704343003/ )

Reason for revert:
Broke https://build.chromium.org/p/chromium/builders/Linux%20x64

See https://build.chromium.org/p/chromium/builders/Linux%20x64/builds/34559 and
https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium%2FLinux_x64%2F3...

Original issue's description:
> Catch up the spec update in CSS Rhythmic Sizing
> 
> This patch catches up spec changes in CSS Rhythmic Sizing[1]. In
> particular:
> 1. The property name was changed to 'line-height-step'.
> 2. The value syntax was changed to single <length>.
> 3. The baseline position feature was removed.
> 
> Tests in csswg-test were updated[2] and imported to fail. All of them
> pass in this patch.
> 
> The feature is still behind the flag.
> 
> [1] https://drafts.csswg.org/css-rhythm/
> [2]
https://github.com/w3c/csswg-test/commit/50a861a451a1fe9cc80044568c2572127297...
> 
> BUG=586413
> 
> Review-Url: https://codereview.chromium.org/2704343003
> Cr-Commit-Position: refs/heads/master@{#455008}
> Committed:
https://chromium.googlesource.com/chromium/src/+/2344921f94b85be9884ed847d9a0...

TBR=meade@chromium.org,sashab@chromium.org,eae@chromium.org,kojii@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=586413

Review-Url: https://codereview.chromium.org/2737673003
Cr-Commit-Position: refs/heads/master@{#455020}
Committed:
https://chromium.googlesource.com/chromium/src/+/3204d73f00beb67fb13aaf079be3...
==========

[commit-bot: I haz the power, 2017-03-07 01:30:25]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/3204d73f00beb67fb13aaf079be3...

[eae, 2017-03-07 01:36:54]

LGTM (post facto)