Change MultipartFile.fromFile to MultipartFile.fromPath in pkg/http.

This re-commits r19185, with all package: imports removed from pkg/http so that
it can transitively depend on pkg/path without breaking pub. This also marks
pkg/http/multipart_test as skipped temporarily (see issue 8843).

Review URL: https://codereview.chromium.org//12385007

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/http@19194 260f80e4-7a28-3924-810f-c04153c831b5
9 files changed
tree: d1da42b8879a3b5b802cbc701c53e673163c021b
  1. lib/
  2. test/
  3. pubspec.yaml