Fix the prompt so the user can interact with svn.
Fix the prompt so the user can interact with svn.

When using svn for try job for the first time, svn will ask for the credentials.

TEST=none
BUG=none

Review URL: http://codereview.chromium.org/223024

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@27103 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

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