Add a pre-bootstrap message for NetworkProcess XPC service
https://bugs.webkit.org/show_bug.cgi?id=111127

Patch by Kiran Muppala <cmuppala@apple.com> on 2013-02-28
Reviewed by Sam Weinig.

* Shared/EntryPointUtilities/mac/XPCService/XPCServiceMain.Development.mm:
(WebKit::XPCServiceEventHandler): Hold on to the pre-bootstrap message.
* Shared/EntryPointUtilities/mac/XPCService/XPCServiceMain.mm:
(WebKit::XPCServiceEventHandler): Ditto.
* UIProcess/Launcher/mac/ProcessLauncherMac.mm:
(WebKit::connectToService): Send a pre-bootstrap message for NetworkProcess
XPC service.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144409 268f45cc-cd09-0410-ab3c-d52691b4dbfc