https://bugs.webkit.org/show_bug.cgi?id=119672

Reviewed by Darin Adler.

Source/WebCore:

The last extractedStyle parameter of removeInlineStyleFromElement() is not mandatory and it's set
to default 0. This way we have to check its existence before the usage.

Test: editing/execCommand/extracted_style_assert.html

* editing/ApplyStyleCommand.cpp:
(WebCore::ApplyStyleCommand::removeInlineStyleFromElement):

LayoutTests:

Test with NULL extractedStyle.

* editing/execCommand/extracted_style_assert-expected.txt: Added.
* editing/execCommand/extracted_style_assert.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154439 268f45cc-cd09-0410-ab3c-d52691b4dbfc