Standardize errno's from a few dart:io File and Link calls

Standardize errno's from a few dart:io File and Link calls

No new tests because I'm just returning more sensical errors in cases
that were already errors.

Not touching Windows. It's doing its own thing.

fixes #28201, #28202, #28204

R=johnmccutchan@google.com

Committed: https://github.com/dart-lang/sdk/commit/5e2898887b92758afef1966f17977931430fdd91

[zra, 2017-01-04 18:24:01]

Description was changed from

==========
Standardize errno's from a few dart:io File calls

No new tests because I'm just returning more sensical errors in cases
that were already errors.

Not touching Windows. It's doing its own thing.

fixes #28201, #28202, #28204
==========

to

==========
Standardize errno's from a few dart:io File and Link calls

No new tests because I'm just returning more sensical errors in cases
that were already errors.

Not touching Windows. It's doing its own thing.

fixes #28201, #28202, #28204
==========

[zra, 2017-01-04 18:24:59]

zra@google.com changed reviewers:
+ johnmccutchan@google.com

[Cutch, 2017-01-04 18:28:45]

Would be nice to add regression tests that make sure the error codes stay like
this.

lgtm.

[zra, 2017-01-04 21:09:12]

Description was changed from

==========
Standardize errno's from a few dart:io File and Link calls

No new tests because I'm just returning more sensical errors in cases
that were already errors.

Not touching Windows. It's doing its own thing.

fixes #28201, #28202, #28204
==========

to

==========
Standardize errno's from a few dart:io File and Link calls

No new tests because I'm just returning more sensical errors in cases
that were already errors.

Not touching Windows. It's doing its own thing.

fixes #28201, #28202, #28204

R=johnmccutchan@google.com

Committed:
https://github.com/dart-lang/sdk/commit/5e2898887b92758afef1966f17977931430fdd91
==========

[zra, 2017-01-04 21:09:13]

Committed patchset #1 (id:1) manually as
5e2898887b92758afef1966f17977931430fdd91 (presubmit successful).