ASSERT in KURL::KURL() when url did not inlude path.

Construct a url :  KURL(ParsedURLString, "http://www.example.com" );

KURL hits ASSERT(url == m_string) because KURL appends a slash at the end of m_string

It's reproducible with CURL ResourceHandleManager.cpp:

headerCallback(char* ptr, size_t size, size_t nmemb, void* data){
...
curl_easy_getinfo(h, CURLINFO_EFFECTIVE_URL, &hdr);
/*  hdr might not contain a path */
d->m_response.setURL(KURL(ParsedURLString, hdr));

}

[Alexey Proskuryakov]

The ParsedURLString constructor can only be used with strings returned by KURL::string() (and then only if the URL was valid).

It's a performance optimization applicable when we know that the string is normalized the way KURL likes it. For arbitrary URL strings, use a proper constructor with a correct base URL.