Make rebase_path("//foo", "//foo") resolve to "." (not "../foo")

BUG=647679

Review-Url: https://codereview.chromium.org/2346913003
Cr-Original-Commit-Position: refs/heads/master@{#419229}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 3d56c98e60572a809a47918ef98e7b3d9138c5ad
2 files changed
tree: 037bc938ebdc0f9855d36da9535dc8234979c49f
  1. tools/