[BlackBerry] Add stubs for DNSResolveQueue platform specific methods
https://bugs.webkit.org/show_bug.cgi?id=111841

Patch by Carlos Garcia Campos <cgarcia@igalia.com> on 2013-03-08
Reviewed by Rob Buis.

Add empty implementations of
DNSResolveQueue::platformProxyIsEnabledInSystemPreferences() and
DNSResolveQueue::platformResolve() to DNSBlackBerry.cpp to make it
build.

* platform/network/blackberry/DNSBlackBerry.cpp:
(WebCore::DNSResolveQueue::platformProxyIsEnabledInSystemPreferences):
(WebCore::DNSResolveQueue::platformResolve):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@145232 268f45cc-cd09-0410-ab3c-d52691b4dbfc