Revert "go/buildutil, cmd/guru: fix tests for symlinks in guru and gorename to account for windows." 

Reason: ContainingPackage must do all I/O through build.Context.

This reverts commit c945ee3be47cb14cbc5e48ff0572d967d772d8b9.

Change-Id: I625410bc754ea2d150be097bf424de2be42acde4
Reviewed-on: https://go-review.googlesource.com/33921
Reviewed-by: Alan Donovan <adonovan@google.com>
3 files changed