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

net/socket_stream/socket_stream_job_manager.h

Index: net/socket_stream/socket_stream_job_manager.h
diff --git a/net/socket_stream/socket_stream_job_manager.h b/net/socket_stream/socket_stream_job_manager.h
index 1150058ccd8aed2f68b5e6b7744d79428e61f7e6..fbd572d6698ea973dd4d4f01893f830abbac5ce5 100644
--- a/net/socket_stream/socket_stream_job_manager.h
+++ b/net/socket_stream/socket_stream_job_manager.h
@@ -12,14 +12,15 @@
 #include "net/socket_stream/socket_stream.h"
 #include "net/socket_stream/socket_stream_job.h"
 
+template <typename T> struct DefaultSingletonTraits;
 class GURL;
 
 namespace net {
 
 class SocketStreamJobManager {
  public:
-  SocketStreamJobManager();
-  ~SocketStreamJobManager();
+  // Returns the singleton instance.
+  static SocketStreamJobManager* GetInstance();
 
   SocketStreamJob* CreateJob(
       const GURL& url, SocketStream::Delegate* delegate) const;
@@ -28,8 +29,12 @@ class SocketStreamJobManager {
       const std::string& scheme, SocketStreamJob::ProtocolFactory* factory);
 
  private:
+  friend struct DefaultSingletonTraits<SocketStreamJobManager>;
   typedef std::map<std::string, SocketStreamJob::ProtocolFactory*> FactoryMap;
 
+  SocketStreamJobManager();
+  ~SocketStreamJobManager();
+
   mutable Lock lock_;
   FactoryMap factories_;