Add QuicStringPiece which is actually StringPiece.

net/quic/core/crypto/channel_id_test.cc

Index: net/quic/core/crypto/channel_id_test.cc
diff --git a/net/quic/core/crypto/channel_id_test.cc b/net/quic/core/crypto/channel_id_test.cc
index 38931fd61f1299ba76237a9b274cf1bd87193f0a..6fac40f04901f55a8444b484502df2d0de2bc470 100644
--- a/net/quic/core/crypto/channel_id_test.cc
+++ b/net/quic/core/crypto/channel_id_test.cc
@@ -9,7 +9,6 @@
 #include "net/quic/test_tools/crypto_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using base::StringPiece;
 using std::string;
 
 namespace net {
@@ -274,10 +273,11 @@ TEST(ChannelIDTest, VerifyKnownAnswerTest) {
     EXPECT_EQ(sizeof(signature) / 2, r_len);
     EXPECT_EQ(sizeof(signature) / 2, s_len);
 
-    EXPECT_EQ(test_vector[i].result,
-              ChannelIDVerifier::VerifyRaw(
-                  StringPiece(key, sizeof(key)), StringPiece(msg, msg_len),
-                  StringPiece(signature, sizeof(signature)), false));
+    EXPECT_EQ(
+        test_vector[i].result,
+        ChannelIDVerifier::VerifyRaw(
+            QuicStringPiece(key, sizeof(key)), QuicStringPiece(msg, msg_len),
+            QuicStringPiece(signature, sizeof(signature)), false));
   }
 }