Fixed: <rdar://problem/4099552> REGRESSION: Safari 1.3 Netscape API NPN_PostURL[Notify] no longer allows manual headers

	Most plugins (flash) send 2 CRFL's between the header and body of their POST requests, while the adboe plugin sends two LF's. This caused us to send custom headers as part of the actual POST data itself, and correspondently, would skew Content-Length.

        * Plugins.subproj/WebBaseNetscapePluginView.m:
        (-[NSData _web_locationAfterFirstBlankLine]): Look for two LF's as well


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@9653 268f45cc-cd09-0410-ab3c-d52691b4dbfc