Add QuicStringPiece which is actually StringPiece.

net/quic/chromium/quic_utils_chromium.cc

Index: net/quic/chromium/quic_utils_chromium.cc
diff --git a/net/quic/chromium/quic_utils_chromium.cc b/net/quic/chromium/quic_utils_chromium.cc
index 7d3ba451f91392bbb5b382d7864c1707b2eae6b8..ef15dc33e37f1af505fbf5de4ef525a2d7d1b039 100644
--- a/net/quic/chromium/quic_utils_chromium.cc
+++ b/net/quic/chromium/quic_utils_chromium.cc
@@ -5,8 +5,8 @@
 #include "net/quic/chromium/quic_utils_chromium.h"
 
 #include "base/containers/adapters.h"
-#include "base/strings/string_piece.h"
 #include "base/strings/string_split.h"
+#include "net/quic/platform/api/quic_string_piece.h"
 
 namespace net {
 
@@ -15,7 +15,7 @@ QuicTagVector ParseQuicConnectionOptions(
   QuicTagVector options;
   // Tokens are expected to be no more than 4 characters long, but
   // handle overflow gracefully.
-  for (const base::StringPiece& token :
+  for (const QuicStringPiece& token :
        base::SplitStringPiece(connection_options, ",", base::TRIM_WHITESPACE,
                               base::SPLIT_WANT_ALL)) {
     uint32_t option = 0;