Remove now-unused toolchain tarball directories from DEPS
Remove now-unused toolchain tarball directories from DEPS

The binutils/gcc/newlib/gdb tarballs are no longer used now that we
have switched the toolchain build to building from Git repositories.

This should reduce checkout time because it reduces the size of the
checkout by 150MB.

BUG=http://code.google.com/p/nativeclient/issues/detail?id=1132
TEST=trybots, just in case

Review URL: http://codereview.chromium.org/6546039

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@4361 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

nacl-webkit/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client