Switching off svn in naclports fetch recipe.
Switching off svn in naclports fetch recipe.

BUG=https://code.google.com/p/chromium/issues/detail?id=409185
TEST=local
R=iannucci@chromium.org

Review URL: https://codereview.chromium.org/555383002

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@291900 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

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