Fix return type of native methods to match the implementation. (These native implementations do not throw an exception, instead they return on OSError object). Related to the error seen in https://github.com/dart-lang/sdk/issues/48456 Change-Id: I6c98687d069073c4aa9d0344e79e777024590541 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/234662 Reviewed-by: Ben Konyi <bkonyi@google.com> Commit-Queue: Siva Annamalai <asiva@google.com>
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