Roll toolchain DEPS to 6942.
Roll toolchain DEPS to 6942.

TBR= ncbray
Review URL: http://codereview.chromium.org/8314007

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@6943 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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