Improve HttpStreamFactory NetLog events

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 e6bcbe42c68a3fabb2259f8332fa58b1537a3970..57346a67e9b21d5faa3ede59cbb2b15b3956d25b 100644
--- a/net/http/http_stream_factory_impl_request.cc
+++ b/net/http/http_stream_factory_impl_request.cc
@@ -21,7 +21,7 @@ HttpStreamFactoryImpl::Request::Request(
     HttpStreamRequest::Delegate* delegate,
     WebSocketHandshakeStreamBase::CreateHelper*
         websocket_handshake_stream_create_helper,
-    const NetLogWithSource& net_log,
+    const NetLogWithSource* net_log,
     StreamType stream_type)
     : url_(url),
       helper_(helper),
@@ -35,12 +35,13 @@ HttpStreamFactoryImpl::Request::Request(
       using_spdy_(false),
       stream_type_(stream_type) {
   DCHECK(delegate_);
+  DCHECK(net_log_);
 
-  net_log_.BeginEvent(NetLogEventType::HTTP_STREAM_REQUEST);
+  net_log_->BeginEvent(NetLogEventType::HTTP_STREAM_REQUEST);
 }
 
 HttpStreamFactoryImpl::Request::~Request() {
-  net_log_.EndEvent(NetLogEventType::HTTP_STREAM_REQUEST);
+  net_log_->EndEvent(NetLogEventType::HTTP_STREAM_REQUEST);
   helper_->OnRequestComplete();
 }