Fix physical_file_system_test.dart on Windows.

Fix physical_file_system_test.dart on Windows.

With the simplification to PhysicalFileSystem introduced in
fef4569eb5a80c72b1f7b89dfac96cd78f2b19cf, the URI "/foo.dart" is now
uniformly treated as equivalent to "file:///foo.dart", even on
Windows.  (At the time the file is read, the file will be located on
the current drive).  This is consistent with what we do for relative
paths.

TBR=sigmund@google.com

Committed: https://github.com/dart-lang/sdk/commit/577c91ba27f4c384d063b2d4703876c0e8106003

[Paul Berry, 2017-01-13 13:51:06]

Description was changed from

==========
Fix physical_file_system_test.dart on Windows.

With the simplification to PhysicalFileSystem introduced in
fef4569eb5a80c72b1f7b89dfac96cd78f2b19cf, the URI "/foo.dart" is now
uniformly treated as equivalent to "file:///foo.dart", even on
Windows.  (At the time the file is read, the file will be located on
the current drive).  This is consistent with what we do for relative
paths.

TBR=sigmund@google.com
==========

to

==========
Fix physical_file_system_test.dart on Windows.

With the simplification to PhysicalFileSystem introduced in
fef4569eb5a80c72b1f7b89dfac96cd78f2b19cf, the URI "/foo.dart" is now
uniformly treated as equivalent to "file:///foo.dart", even on
Windows.  (At the time the file is read, the file will be located on
the current drive).  This is consistent with what we do for relative
paths.

TBR=sigmund@google.com

Committed:
https://github.com/dart-lang/sdk/commit/577c91ba27f4c384d063b2d4703876c0e8106003
==========

[Paul Berry, 2017-01-13 13:51:07]

Committed patchset #1 (id:1) manually as
577c91ba27f4c384d063b2d4703876c0e8106003 (presubmit successful).

[Siggi Cherem (dart-lang), 2017-01-13 16:01:41]

lgtm