Reduce SpdyHeaderBlock copies with move semantics in shared code.

net/tools/quic/quic_simple_server_stream.h

Index: net/tools/quic/quic_simple_server_stream.h
diff --git a/net/tools/quic/quic_simple_server_stream.h b/net/tools/quic/quic_simple_server_stream.h
index ca39e5007a285a6e221b9112ce144ae8a254bb6e..e270ed65f17c178493c36bd1dd6d6fa2dee84c4c 100644
--- a/net/tools/quic/quic_simple_server_stream.h
+++ b/net/tools/quic/quic_simple_server_stream.h
@@ -64,11 +64,11 @@ class QuicSimpleServerStream : public QuicSpdyStream {
   // for the body.
   void SendNotFoundResponse();
 
-  void SendHeadersAndBody(const SpdyHeaderBlock& response_headers,
+  void SendHeadersAndBody(SpdyHeaderBlock response_headers,
                           base::StringPiece body);
-  void SendHeadersAndBodyAndTrailers(const SpdyHeaderBlock& response_headers,
+  void SendHeadersAndBodyAndTrailers(SpdyHeaderBlock response_headers,
                                      base::StringPiece body,
-                                     const SpdyHeaderBlock& response_trailers);
+                                     SpdyHeaderBlock response_trailers);
 
   SpdyHeaderBlock* request_headers() { return &request_headers_; }