Add QuicStringPiece which is actually StringPiece.

net/quic/platform/api/quic_url.cc

Index: net/quic/platform/api/quic_url.cc
diff --git a/net/quic/platform/api/quic_url.cc b/net/quic/platform/api/quic_url.cc
index 950f9dd877ea63a4f5c176a433e4b9185020975c..1dd770893c073e7928d9413166537b42e92bc6fa 100644
--- a/net/quic/platform/api/quic_url.cc
+++ b/net/quic/platform/api/quic_url.cc
@@ -4,14 +4,13 @@
 
 #include "net/quic/platform/api/quic_url.h"
 
-using base::StringPiece;
 using std::string;
 
 namespace net {
 
-QuicUrl::QuicUrl(StringPiece url) : impl_(url) {}
+QuicUrl::QuicUrl(QuicStringPiece url) : impl_(url) {}
 
-QuicUrl::QuicUrl(StringPiece url, StringPiece default_scheme)
+QuicUrl::QuicUrl(QuicStringPiece url, QuicStringPiece default_scheme)
     : impl_(url, default_scheme) {}
 
 QuicUrl::QuicUrl(const QuicUrl& url) : impl_(url.impl()) {}