Add QuicStringPiece which is actually StringPiece.

net/tools/quic/chlo_extractor.cc

Index: net/tools/quic/chlo_extractor.cc
diff --git a/net/tools/quic/chlo_extractor.cc b/net/tools/quic/chlo_extractor.cc
index 14ac9e300670f2e1c7f3d81deb4dd85278ccd631..56a40573bb12dd0655b564a0290b5b6a2534dbe4 100644
--- a/net/tools/quic/chlo_extractor.cc
+++ b/net/tools/quic/chlo_extractor.cc
@@ -10,10 +10,9 @@
 #include "net/quic/core/crypto/quic_decrypter.h"
 #include "net/quic/core/crypto/quic_encrypter.h"
 #include "net/quic/core/quic_framer.h"
+#include "net/quic/platform/api/quic_string_piece.h"
 #include "net/quic/platform/api/quic_text_utils.h"
 
-using base::StringPiece;
-
 namespace net {
 
 namespace {
@@ -91,7 +90,7 @@ bool ChloFramerVisitor::OnPacketHeader(const QuicPacketHeader& header) {
   return true;
 }
 bool ChloFramerVisitor::OnStreamFrame(const QuicStreamFrame& frame) {
-  StringPiece data(frame.data_buffer, frame.data_length);
+  QuicStringPiece data(frame.data_buffer, frame.data_length);
   if (frame.stream_id == kCryptoStreamId && frame.offset == 0 &&
       QuicTextUtils::StartsWith(data, "CHLO")) {
     CryptoFramer crypto_framer;