Fix a potential infinite loop in HttpStreamFactoryImpl when a new SpdySession is established

net/http/http_stream_factory_impl_request.cc

Index: net/http/http_stream_factory_impl_request.cc
diff --git a/net/http/http_stream_factory_impl_request.cc b/net/http/http_stream_factory_impl_request.cc
index 76abed6add388def2342e627b4afbc70e944bd53..97ec79367c1e89265d3ab91d444f2898aefd9765 100644
--- a/net/http/http_stream_factory_impl_request.cc
+++ b/net/http/http_stream_factory_impl_request.cc
@@ -154,12 +154,6 @@ const ConnectionAttempts& HttpStreamFactoryImpl::Request::connection_attempts()
   return connection_attempts_;
 }
 
-void HttpStreamFactoryImpl::Request::ResetSpdySessionKey() {
-  if (spdy_session_key_.get()) {
-    spdy_session_key_.reset();
-  }
-}
-
 bool HttpStreamFactoryImpl::Request::HasSpdySessionKey() const {
   return spdy_session_key_.get() != NULL;
 }