<rdar://problem/10208291> first-letter in generated before content with display:...

<rdar://problem/10208291> first-letter in generated before content with display: table is not updated

Reviewed by Sam Weinig.

Source/WebCore:

Test: fast/css-generated-content/first-letter-in-nested-before.html

* rendering/RenderObjectChildList.cpp:
(WebCore::RenderObjectChildList::updateBeforeAfterContent): Preserve the style type of anonymous
containers around the generated content when updating their style. This preserves the first-letter-ness
of the inline wrapping the first letter, which allows updateFirstLetter() to identify it later.

LayoutTests:

* fast/css-generated-content/first-letter-in-nested-before-expected.png: Added.
* fast/css-generated-content/first-letter-in-nested-before-expected.txt: Added.
* fast/css-generated-content/first-letter-in-nested-before.html: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@96427 268f45cc-cd09-0410-ab3c-d52691b4dbfc