Add QuicStringPiece which is actually StringPiece.

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 1471aada756aff8e63dac7f0ceee9837cc6c37cf..5cc8e5e903dc68b1e9a4d25b758f31b49732ce1d 100644
--- a/net/tools/quic/quic_simple_server_stream.h
+++ b/net/tools/quic/quic_simple_server_stream.h
@@ -10,6 +10,7 @@
 #include "base/macros.h"
 #include "net/quic/core/quic_packets.h"
 #include "net/quic/core/quic_spdy_stream.h"
+#include "net/quic/platform/api/quic_string_piece.h"
 #include "net/spdy/spdy_framer.h"
 #include "net/tools/quic/quic_http_response_cache.h"
 #include "net/tools/quic/quic_spdy_server_stream_base.h"
@@ -64,9 +65,9 @@ class QuicSimpleServerStream : public QuicSpdyServerStreamBase {
   void SendNotFoundResponse();
 
   void SendHeadersAndBody(SpdyHeaderBlock response_headers,
-                          base::StringPiece body);
+                          QuicStringPiece body);
   void SendHeadersAndBodyAndTrailers(SpdyHeaderBlock response_headers,
-                                     base::StringPiece body,
+                                     QuicStringPiece body,
                                      SpdyHeaderBlock response_trailers);
 
   SpdyHeaderBlock* request_headers() { return &request_headers_; }