Revert "Pass absolute path to git (redux)."

This reverts commit 9d638b8a9a48c7bae854685f9413d2c40a4911a1.

BUG=

Review URL: https://codereview.chromium.org//11361158

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@14661 260f80e4-7a28-3924-810f-c04153c831b5
3 files changed