Added use_sdk=False to toolchain config.
Added use_sdk=False to toolchain config.

zbehan submitted CL https://gerrit.chromium.org/gerrit/#/c/30569/, which applied
the same change to the toolchain minor config. This one applies it to the
toolchain master config.

BUG=none
TEST=Remote trybot.

Change-Id: Ib5744ad84f44efe8a7156f17b860d8a9d4177b3d
Reviewed-on: https://gerrit.chromium.org/gerrit/31120
Commit-Ready: asharif <0bffdc695497b480334d6a40467f7e340b20eba1@chromium.org>
Tested-by: asharif <0bffdc695497b480334d6a40467f7e340b20eba1@chromium.org>
Reviewed-by: Zdenek Behan <483cf2a9a4e071d4fd973db6a5a78c40f490667c@chromium.org>

bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,coreos/chromite,zhang0137/chromite,chadversary/chromiumos.chromite,chadversary/chromiumos.chromite,coreos/chromite,coreos/chromite,zhang0137/chromite,zhang0137/chromite