Add a new QUIC platform API for text utilities.

net/quic/core/quic_flow_controller_test.cc

 // Copyright 2014 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/quic/core/quic_flow_controller.h"
 
 #include <memory>
 
 #include "base/format_macros.h"
-#include "base/strings/stringprintf.h"
 #include "net/quic/platform/api/quic_str_cat.h"
 #include "net/quic/test_tools/quic_connection_peer.h"
 #include "net/quic/test_tools/quic_flow_controller_peer.h"
 #include "net/quic/test_tools/quic_sent_packet_manager_peer.h"
 #include "net/quic/test_tools/quic_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using testing::_;
 
 namespace net {
@@ skipping 343 matching lines @@
   EXPECT_FALSE(flow_controller_->FlowControlViolation());
 
   QuicByteCount new_threshold =
       QuicFlowControllerPeer::WindowUpdateThreshold(flow_controller_.get());
 
   EXPECT_EQ(new_threshold, threshold);
 }
 
 }  // namespace test
 }  // namespace net