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

net/url_request/url_request_job_manager.cc

Index: net/url_request/url_request_job_manager.cc
diff --git a/net/url_request/url_request_job_manager.cc b/net/url_request/url_request_job_manager.cc
index 1bc0be1214a15276126e08f4b1942b4e44951d9c..117c15acdfb20c1e1cb6445eb0011baf4c6d052d 100644
--- a/net/url_request/url_request_job_manager.cc
+++ b/net/url_request/url_request_job_manager.cc
@@ -7,6 +7,7 @@
 #include <algorithm>
 
 #include "build/build_config.h"
+#include "base/singleton.h"
 #include "base/string_util.h"
 #include "net/base/load_flags.h"
 #include "net/base/net_errors.h"
@@ -45,6 +46,11 @@ URLRequestJobManager::URLRequestJobManager() : enable_file_access_(false) {
 
 URLRequestJobManager::~URLRequestJobManager() {}
 
+// static
+URLRequestJobManager* URLRequestJobManager::GetInstance() {
+  return Singleton<URLRequestJobManager>::get();
+}
+
 URLRequestJob* URLRequestJobManager::CreateJob(net::URLRequest* request) const {
 #ifndef NDEBUG
   DCHECK(IsAllowedThread());