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

net/url_request/url_request_job_manager.h

Index: net/url_request/url_request_job_manager.h
diff --git a/net/url_request/url_request_job_manager.h b/net/url_request/url_request_job_manager.h
index 6d2421aac90e96c1f896162d612a5ee32561bd20..c4e427d3e017f473326be13efe236dc0c68b101d 100644
--- a/net/url_request/url_request_job_manager.h
+++ b/net/url_request/url_request_job_manager.h
@@ -12,6 +12,7 @@
 
 #include "base/lock.h"
 #include "base/platform_thread.h"
+#include "base/singleton.h"
 #include "net/url_request/url_request.h"
 
 // This class is responsible for managing the set of protocol factories and
@@ -27,8 +28,8 @@
 //
 class URLRequestJobManager {
  public:
-  URLRequestJobManager();
-  ~URLRequestJobManager();
+  // Returns the singleton instance.
+  static URLRequestJobManager* GetInstance();
 
   // Instantiate an URLRequestJob implementation based on the registered
   // interceptors and protocol factories.  This will always succeed in
@@ -67,6 +68,10 @@ class URLRequestJobManager {
  private:
   typedef std::map<std::string, net::URLRequest::ProtocolFactory*> FactoryMap;
   typedef std::vector<net::URLRequest::Interceptor*> InterceptorList;
+  friend struct DefaultSingletonTraits<URLRequestJobManager>;
+
+  URLRequestJobManager();
+  ~URLRequestJobManager();
 
   mutable Lock lock_;
   FactoryMap factories_;