self._Capture -> scm.GIT.Capture.
self._Capture -> scm.GIT.Capture.

This is a special case where we want to run a git command, even if
it's an SVNWrapper instance.

R=iannucci@chromium.org,agable@chromium.org
BUG=369145

Review URL: https://codereview.chromium.org/264913006

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@267707 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

svn2github/chromium-depot-tools,svn2github/chromium-depot-tools,svn2github/chromium-depot-tools