Add an URLRequestTest to test the quic server info factory setup at the creation of HttpCache.

net/quic/chromium/quic_stream_factory.h

Index: net/quic/chromium/quic_stream_factory.h
diff --git a/net/quic/chromium/quic_stream_factory.h b/net/quic/chromium/quic_stream_factory.h
index 48828daf7b80cdf44be0533dfefce8ae0adeeb33..047623a1bc5154e87b5bb6f3835cffa954b2e5ef 100644
--- a/net/quic/chromium/quic_stream_factory.h
+++ b/net/quic/chromium/quic_stream_factory.h
@@ -375,10 +375,14 @@ class NET_EXPORT_PRIVATE QuicStreamFactory
 
   QuicChromiumAlarmFactory* alarm_factory() { return alarm_factory_.get(); }
 
-  bool has_quic_server_info_factory() {
+  bool has_quic_server_info_factory() const {
     return quic_server_info_factory_.get() != nullptr;
   }
 
+  QuicServerInfoFactory* quic_server_info_factory() const {
+    return quic_server_info_factory_.get();
+  }
+
   void set_quic_server_info_factory(
       QuicServerInfoFactory* quic_server_info_factory);