Fixes build of file_android.cc.

runtime/bin/file_android.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_ANDROID)
 
 #include "bin/file.h"
 
 #include <errno.h>  // NOLINT
@@ skipping 219 matching lines @@
     int old_fd = TEMP_FAILURE_RETRY(open(old_path, O_RDONLY | O_CLOEXEC));
     if (old_fd < 0) {
       return false;
     }
     int new_fd = TEMP_FAILURE_RETRY(
         open(new_path, O_WRONLY | O_TRUNC | O_CREAT | O_CLOEXEC, st.st_mode));
     if (new_fd < 0) {
       VOID_TEMP_FAILURE_RETRY(close(old_fd));
       return false;
     }
-    off64_t offset = 0;
+    off_t offset = 0;
     int result = 1;
     while (result > 0) {
       // Loop to ensure we copy everything, and not only up to 2GB.
       result = TEMP_FAILURE_RETRY(
           sendfile(new_fd, old_fd, &offset, kMaxUint32));
     }
     if (result < 0 && (errno == EINVAL || errno == ENOSYS)) {
       const intptr_t kBufferSize = 8 * 1024;
       uint8_t buffer[kBufferSize];
       while ((result = TEMP_FAILURE_RETRY(
@@ skipping 161 matching lines @@
   return (file_1_info.st_ino == file_2_info.st_ino &&
           file_1_info.st_dev == file_2_info.st_dev) ?
       File::kIdentical :
       File::kDifferent;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_ANDROID)