Use the exact-width integer types defined in <stdint.h> rather than

net/base/mime_sniffer_perftest.cc

 // Copyright 2015 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/base/mime_sniffer.h"
 
 #include <vector>
 
 #include "base/bits.h"
 #include "base/logging.h"
@@ skipping 81 matching lines @@
       static_cast<size_t>(
           1u << base::bits::Log2Ceiling(kTargetSize / plaintext.size()));
   plaintext.reserve(expected_size);
   while (plaintext.size() < kTargetSize)
     plaintext += plaintext;
   DCHECK_EQ(expected_size, plaintext.size());
   RunLooksLikeBinary(plaintext, kWarmupIterations);
   base::ElapsedTimer elapsed_timer;
   RunLooksLikeBinary(plaintext, kMeasuredIterations);
   LOG(INFO) << (elapsed_timer.Elapsed().InMicroseconds() * 1000 * 1024 /
-                (static_cast<int64>(plaintext.size()) * kMeasuredIterations))
+                (static_cast<int64_t>(plaintext.size()) * kMeasuredIterations))
             << "ns per KB";
 }
 
 }  // namespace net
 }  // namespace