Revert of Remove reference counting from HttpNetworkSession.

net/spdy/spdy_stream_unittest.cc

Index: net/spdy/spdy_stream_unittest.cc
diff --git a/net/spdy/spdy_stream_unittest.cc b/net/spdy/spdy_stream_unittest.cc
index e4fd077d01545b9ec48f144860d1e77f2e4d4f90..044be4bd238561d48eb8451fcbb8a9be95bb71fe 100644
--- a/net/spdy/spdy_stream_unittest.cc
+++ b/net/spdy/spdy_stream_unittest.cc
@@ -55,7 +55,7 @@
   base::WeakPtr<SpdySession> CreateDefaultSpdySession() {
     SpdySessionKey key(HostPortPair("www.example.org", 80),
                        ProxyServer::Direct(), PRIVACY_MODE_DISABLED);
-    return CreateInsecureSpdySession(session_.get(), key, BoundNetLog());
+    return CreateInsecureSpdySession(session_, key, BoundNetLog());
   }
 
   void TearDown() override { base::MessageLoop::current()->RunUntilIdle(); }
@@ -99,7 +99,7 @@
 
   SpdyTestUtil spdy_util_;
   SpdySessionDependencies session_deps_;
-  scoped_ptr<HttpNetworkSession> session_;
+  scoped_refptr<HttpNetworkSession> session_;
 
  private:
   // Used by Add{Read,Write}() above.