Revert "Extend file-system abstraction with a couple methods, remove context."

Revert "Extend file-system abstraction with a couple methods, remove context."

This reverts commit 99ab24f628b23f248582874a6987883ab76c3195.

Tests failed under `--use-sdk`. Fix is simple, but the affected tests seem to
be failing because of another CL as well.

TBR=brianwilkerson@google.com,paulberry@google.com

Committed: https://github.com/dart-lang/sdk/commit/6ce9d4e1fb469f0077c0651f80152a0d7594e0b6

[Siggi Cherem (dart-lang), 2017-04-27 21:46:45]

Description was changed from

==========
Revert "Extend file-system abstraction with a couple methods, remove context."

This reverts commit 99ab24f628b23f248582874a6987883ab76c3195.

Tests failed under `--use-sdk`. Fix is simple, but the affected tests seem to
be failing because of another CL as well.

TBR=brianwilkerson@google.com,paulberry@google.com
==========

to

==========
Revert "Extend file-system abstraction with a couple methods, remove context."

This reverts commit 99ab24f628b23f248582874a6987883ab76c3195.

Tests failed under `--use-sdk`. Fix is simple, but the affected tests seem to
be failing because of another CL as well.

TBR=brianwilkerson@google.com,paulberry@google.com

Committed:
https://github.com/dart-lang/sdk/commit/6ce9d4e1fb469f0077c0651f80152a0d7594e0b6
==========

[Siggi Cherem (dart-lang), 2017-04-27 21:46:47]

Committed patchset #1 (id:1) manually as
6ce9d4e1fb469f0077c0651f80152a0d7594e0b6 (presubmit successful).

[Paul Berry, 2017-04-27 21:48:35]

lgtm

[Brian Wilkerson, 2017-04-27 21:51:20]

lgtm