ASSERTION FAILED: !style->propertyIsImportant(propertyID) in WebCore::setTextDecorationProperty

ASSERTION FAILED: !style->propertyIsImportant(propertyID) in WebCore::setTextDecorationProperty

When remove format command is called we pushdown the ancestor style
down to its children. Currently applying inline style to iframe
while pushing down style which causes iframe to be reinserted in tree and
triggres again subframe loading which repeats everytime and finally
crash happens. So we should avoid applying inline style to iframe
element as it does not reflect in its content while pushing down style
on it.

And ASSERT call has been removed from setTextDecoration property as
the scenario is perfectly valid case.

Backported from WebKit: http://trac.webkit.org/changeset/157710 (Patch by Santosh Mahto)

R=hayato@chromium.org
BUG=350943
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=168900

[hayato, 2014-03-11 07:17:22]

LGTM

[reni, 2014-03-11 08:28:49]

The CQ bit was checked by rhodovan.u-szeged@partner.samsung.com

[commit-bot: I haz the power, 2014-03-11 08:28:54]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rhodovan.u-szeged@partner.samsung.com/...

[commit-bot: I haz the power, 2014-03-11 09:30:27]

Change committed as 168900