Improve HttpStreamFactory NetLog events

net/http/http_stream_factory_impl_request.h

Index: net/http/http_stream_factory_impl_request.h
diff --git a/net/http/http_stream_factory_impl_request.h b/net/http/http_stream_factory_impl_request.h
index 91cb0d7a0c1bbcb03c7e61882cdcc47278e4d7a5..332f5da6ce1b65b0fc9bf830fffde313df508b28 100644
--- a/net/http/http_stream_factory_impl_request.h
+++ b/net/http/http_stream_factory_impl_request.h
@@ -50,7 +50,7 @@ class HttpStreamFactoryImpl::Request : public HttpStreamRequest {
           HttpStreamRequest::Delegate* delegate,
           WebSocketHandshakeStreamBase::CreateHelper*
               websocket_handshake_stream_create_helper,
-          const NetLogWithSource& net_log,
+          const NetLogWithSource* net_log,
           StreamType stream_type);
 
   ~Request() override;
@@ -58,8 +58,6 @@ class HttpStreamFactoryImpl::Request : public HttpStreamRequest {
   // The GURL from the HttpRequestInfo the started the Request.
   const GURL& url() const { return url_; }
 
-  const NetLogWithSource& net_log() const { return net_log_; }
-
   // Called when the |helper_| determines the appropriate |spdy_session_key|
   // for the Request. Note that this does not mean that SPDY is necessarily
   // supported for this SpdySessionKey, since we may need to wait for NPN to
@@ -135,7 +133,10 @@ class HttpStreamFactoryImpl::Request : public HttpStreamRequest {
   WebSocketHandshakeStreamBase::CreateHelper* const
       websocket_handshake_stream_create_helper_;
   HttpStreamRequest::Delegate* const delegate_;
-  const NetLogWithSource net_log_;
+
+  // Initialized to point to the NetLogWithSource of JobController. Valid for
+  // the lifetime of |this|.
+  const NetLogWithSource* net_log_;
 
   std::unique_ptr<const SpdySessionKey> spdy_session_key_;