Replace QuicString with std::string, pass 1

This replaces QuicString with std::string in all of the "QUIC proper".  I will
delete QuicString once all code using it is gone.

gfe-relnote: n/a (no functional change)
PiperOrigin-RevId: 237872023
Change-Id: I82de62c9855516b15039734d05155917e68ff4ee
diff --git a/quic/test_tools/simulator/queue.h b/quic/test_tools/simulator/queue.h
index f9fa483..6c3c6b0 100644
--- a/quic/test_tools/simulator/queue.h
+++ b/quic/test_tools/simulator/queue.h
@@ -23,7 +23,7 @@
     virtual void OnPacketDequeued() = 0;
   };
 
-  Queue(Simulator* simulator, QuicString name, QuicByteCount capacity);
+  Queue(Simulator* simulator, std::string name, QuicByteCount capacity);
   Queue(const Queue&) = delete;
   Queue& operator=(const Queue&) = delete;
   ~Queue() override;