Use suffixed {uint,int}{8,16,32,64}_t types.

webrtc/base/fileutils_mock.h

 /*
  *  Copyright 2004 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.
  */
 
@@ skipping 219 matching lines @@
       path->SetPathname("c:\\Users\\test_user", "");
 #else
       path->SetPathname("/home/user/test_user", "");
 #endif
       return true;
     }
     bool GetAppTempFolder(Pathname *path) {
       EXPECT_TRUE(false) << "Unsupported operation";
       return false;
     }
-    bool GetDiskFreeSpace(const Pathname &path, int64 *freebytes) {
+    bool GetDiskFreeSpace(const Pathname& path, int64_t* freebytes) {
       EXPECT_TRUE(false) << "Unsupported operation";
       return false;
     }
     Pathname GetCurrentDirectory() {
       return Pathname();
     }
 
   private:
     const std::vector<File> all_files_;
 };
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_FILEUTILS_MOCK_H_