Remove the last remnant of <style scoped>

Remove the last remnant of <style scoped>

This code was added while <style scoped> was still supported:
http://trac.webkit.org/changeset/125955

The scoped attribute now does nothing anywhere else, so special behavior
for editing doesn't make sense.

TEST=LayoutTests/editing/execCommand/delete-selection-has-style.html

BUG=379096
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=179498

[philipj_slow, 2014-08-04 13:01:53]

PTAL

[kouhei (in TOK), 2014-08-04 18:16:28]

lgtm

[philipj_slow, 2014-08-05 05:03:17]

The CQ bit was checked by philipj@opera.com

[commit-bot: I haz the power, 2014-08-05 05:04:01]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/philipj@opera.com/433663002/1

[commit-bot: I haz the power, 2014-08-05 05:50:04]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  blink_presubmit on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/blink_presubmit/builds/1...)

[commit-bot: I haz the power, 2014-08-05 06:12:43]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-08-05 06:12:43]

Try jobs failed on following builders:
  blink_presubmit on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/blink_presubmit/builds/1...)

[philipj_slow, 2014-08-05 07:34:52]

The CQ bit was checked by philipj@opera.com

[commit-bot: I haz the power, 2014-08-05 07:35:36]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/philipj@opera.com/433663002/1

[commit-bot: I haz the power, 2014-08-05 07:53:49]

Change committed as 179498