Lint clean video/ and add lint presubmit check.

webrtc/video/rampup_tests.cc

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
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 }
 
 Call::Config RampUpDownUpTester::GetReceiverCallConfig() {
   Call::Config config;
   config.bitrate_config.min_bitrate_bps = 10000;
   return config;
 }
 
 std::string RampUpDownUpTester::GetModifierString() const {
   std::string str("_");
-  char temp_str[5];
-  sprintf(temp_str, "%i", static_cast<int>(num_streams_));
-  str += std::string(temp_str);
+  std::ostringstream s;
+  s << num_streams_;
+  str += s.str();
   str += "stream";
   str += (num_streams_ > 1 ? "s" : "");
   str += "_";
   str += (rtx_ ? "" : "no");
   str += "rtx";
   return str;
 }
 
 void RampUpDownUpTester::EvolveTestState(int bitrate_bps, bool suspended) {
   int64_t now = clock_->TimeInMilliseconds();
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   RampUpTester test(3, 0, RtpExtension::kTransportSequenceNumber, true, true);
   RunBaseTest(&test, FakeNetworkPipe::Config());
 }
 
 TEST_F(RampUpTest, TransportSequenceNumberSingleStreamWithHighStartBitrate) {
   RampUpTester test(1, 0.9 * kSingleStreamTargetBps,
                     RtpExtension::kTransportSequenceNumber, false, false);
   RunBaseTest(&test, FakeNetworkPipe::Config());
 }
 }  // namespace webrtc