Add QuicStringPiece which is actually StringPiece.

net/quic/chromium/quic_http_stream.cc

Index: net/quic/chromium/quic_http_stream.cc
diff --git a/net/quic/chromium/quic_http_stream.cc b/net/quic/chromium/quic_http_stream.cc
index f824b46441402ebfab994207b3de7fe8fe1f8345..e6200fbcb85942fa187e96ad5dbe5f004e078b34 100644
--- a/net/quic/chromium/quic_http_stream.cc
+++ b/net/quic/chromium/quic_http_stream.cc
@@ -22,6 +22,7 @@
 #include "net/quic/core/quic_stream_sequencer.h"
 #include "net/quic/core/quic_utils.h"
 #include "net/quic/core/spdy_utils.h"
+#include "net/quic/platform/api/quic_string_piece.h"
 #include "net/spdy/spdy_frame_builder.h"
 #include "net/spdy/spdy_framer.h"
 #include "net/spdy/spdy_http_utils.h"
@@ -738,7 +739,7 @@ int QuicHttpStream::DoSendBody() {
   int len = request_body_buf_->BytesRemaining();
   if (len > 0 || eof) {
     next_state_ = STATE_SEND_BODY_COMPLETE;
-    base::StringPiece data(request_body_buf_->data(), len);
+    QuicStringPiece data(request_body_buf_->data(), len);
     return stream_->WriteStreamData(
         data, eof,
         base::Bind(&QuicHttpStream::OnIOComplete, weak_factory_.GetWeakPtr()));