Use sockets with unread data if they've never been used before.

net/socket/stream_socket.h

Index: net/socket/stream_socket.h
diff --git a/net/socket/stream_socket.h b/net/socket/stream_socket.h
index 38eec86dd92214944f7fd6f3fd2f1e30c823b631..72088103a3d7669f30dd3151da55b975f6f4245c 100644
--- a/net/socket/stream_socket.h
+++ b/net/socket/stream_socket.h
@@ -70,9 +70,9 @@ class NET_EXPORT_PRIVATE StreamSocket : public Socket {
   virtual void SetSubresourceSpeculation() = 0;
   virtual void SetOmniboxSpeculation() = 0;
 
-  // Returns true if the underlying transport socket ever had any reads or
-  // writes.  StreamSockets layered on top of transport sockets should forward
-  // this call to the transport socket.
+  // Returns true if the socket ever had any reads or writes.  StreamSockets
+  // layered on top of transport sockets should return if their own Read() or
+  // Write() methods had been called, not the underlying transport's.
   virtual bool WasEverUsed() const = 0;
 
   // Returns true if the underlying transport socket is using TCP FastOpen.