On line 203 of WebCore/dom/ProcessingInstruction.cpp (http://trac.webkit.org/projects/webkit/browser/trunk/WebCore/dom/ProcessingInstruction.cpp#L203) the "ASSERT(!m_isXSL);" should be wrapped in an #if XSLT_SUPPORT block.
Created attachment 11554 [details]
As the ChangeLog entry says, fixes the issues and does some style fixing.
Comment on attachment 11554 [details]
Landed in r17829.