Add a new GetInstance() method for singleton classes under chrome/service and /net.

net/url_request/url_request_http_job.cc

Index: net/url_request/url_request_http_job.cc
diff --git a/net/url_request/url_request_http_job.cc b/net/url_request/url_request_http_job.cc
index c951088e5c5eddbd6b87c0781568d97f5718612a..f2b1b4fcc317b2979a415860de875de5fa4c8a1b 100644
--- a/net/url_request/url_request_http_job.cc
+++ b/net/url_request/url_request_http_job.cc
@@ -937,7 +937,7 @@ void URLRequestHttpJob::ProcessStrictTransportSecurityHeader() {
     // At this point, we have a request for opportunistic encryption over HTTP.
     // In this case we need to probe to check that we can make HTTPS
     // connections to that host.
-    net::HTTPSProber* const prober = Singleton<net::HTTPSProber>::get();
+    net::HTTPSProber* const prober = net::HTTPSProber::GetInstance();
     if (prober->HaveProbed(request_info_.url.host()) ||
         prober->InFlight(request_info_.url.host())) {
       continue;