[Qt][WK2] http/tests/security/xss-DENIED-xsl-document-securityOrigin.xml crashes

[Qt][WK2] http/tests/security/xss-DENIED-xsl-document-securityOrigin.xml crashes
https://bugs.webkit.org/show_bug.cgi?id=80209

Patch by Michael Brüning <michael.bruning@nokia.com> on 2012-05-15
Reviewed by Kenneth Rohde Christiansen.

This patch adds a method isOpen to WebIconDatabase to
be able to check whether the database has already been opened.
This helps preventing problems when reusing a WebContext
to create another view, as e.g. WebKitTestRunner does it in the
Qt port.

* UIProcess/WebIconDatabase.cpp:
(WebKit::WebIconDatabase::setDatabasePath):
(WebKit::WebIconDatabase::isOpen): Added.
(WebKit):
* UIProcess/WebIconDatabase.h:
(WebIconDatabase):
* UIProcess/qt/QtWebIconDatabaseClient.cpp:
(WebKit::QtWebIconDatabaseClient::QtWebIconDatabaseClient):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@117141 268f45cc-cd09-0410-ab3c-d52691b4dbfc