Convert to use auto-closeable Repository and RevWalk

In the latest version of JGit used on Gerrit master, the Repository
and RevWalk objects are auto-closeable.

Change-Id: I6eb2e5f4af1fc0292c1b4dbb641b7ba0a36bebdf
1 file changed
tree: 8e6f6e196de8d2f5faaeca1919a03d6370e21263
  1. src/
  2. .gitignore
  3. BUCK