Everywhere: Hand pid of new process to client in launch_server_process()

Allows WebContentClient to get pid of WebContent process right after
creation, so there is no window between forking and
notify_process_information() IPC response, when client doesn't know the
pid.

Userland/Services/WebContent/ConnectionFromClient.cpp

@@ -55,7 +55,6 @@ ConnectionFromClient::ConnectionFromClient(NonnullOwnPtr<Core::LocalSocket> sock
     , m_page_host(PageHost::create(*this))
 {
     m_input_event_queue_timer = Web::Platform::Timer::create_single_shot(0, [this] { process_next_input_event(); });
-    async_notify_process_information({ ::getpid() });
 }
 
 ConnectionFromClient::~ConnectionFromClient() = default;