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

Review URL: https://codereview.chromium.org//12382003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/http@19188 260f80e4-7a28-3924-810f-c04153c831b5
3 files changed
tree: f73be2cd550b10e8ba1de62213a4f36765430934
  1. lib/
  2. test/
  3. pubspec.yaml