Apparently, these imports of 'octicon-utf-codes.less' within mixin
definitions cause any subsequent imports of this file to become noops,
because of the way less dedupes imports. The result is that the variables
defined in that file are only available in the nested scope.

This didn't happen in older versions of less because of bugs which
have been fixed since less 2.7.

Signed-off-by: Antonio Scandurra <as-cii@github.com>

With the upgrade of git-utils libgit2 was updated too and the behavior
tested by the deleted spec doesn't seem to be supported anymore.
However, we believe we can delete this test because the only entry point
for creating `GitRepository` instances is `repositoryForDirectorySync`
in `GitRepositoryProvider`, which only allows `Directory` objects to be
supplied as its input arguments.

# Conflicts:
#	package.json