Remove defunct SVN-based gclient configs
Remove defunct SVN-based gclient configs

The URL helper functions were only used by this file,
the svn custom_deps urls aren't referenced in any DEPS
files I can find anymore, and the oilpan and buildspec
configs aren't used by any recipes.

R=hinoka@chromium.org
BUG=640251

Review-Url: https://codereview.chromium.org/2291583003

primiano/depot_tools,CoherentLabs/depot_tools,primiano/depot_tools,CoherentLabs/depot_tools,primiano/depot_tools