Add QuicStrCat.

net/tools/quic/stateless_rejector_test.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/tools/quic/stateless_rejector.h"
 
 #include <memory>
 #include <vector>
 
 #include "base/memory/ptr_util.h"
@@ skipping 33 matching lines @@
   }
 }
 
 // Test various combinations of QUIC version and flag state.
 struct TestParams {
   QuicVersion version;
   FlagsMode flags;
 };
 
 string TestParamToString(const testing::TestParamInfo<TestParams>& params) {
-  return base::StringPrintf("v%i_%s", params.param.version,
-                            FlagsModeToString(params.param.flags));
+  return QuicStrCat("v", params.param.version, "_",
+                    FlagsModeToString(params.param.flags));
 }
 
 std::vector<TestParams> GetTestParams() {
   std::vector<TestParams> params;
   for (FlagsMode flags :
        {ENABLED, STATELESS_DISABLED, CHEAP_DISABLED, BOTH_DISABLED}) {
     for (QuicVersion version : AllSupportedVersions()) {
       TestParams param;
       param.version = version;
       param.flags = flags;
@@ skipping 216 matching lines @@
   ASSERT_EQ(StatelessRejector::UNKNOWN, rejector_->state());
   StatelessRejector::Process(std::move(rejector_),
                              base::MakeUnique<ProcessDoneCallback>(this));
 
   EXPECT_EQ(StatelessRejector::ACCEPTED, rejector_->state());
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net