Supprt an old style config.  All branches should use old_style=True.
Supprt an old style config.  All branches should use old_style=True.

BUG=N0ne
TEST=Tested by changing x86-generic with and without old_style=True
Ran through up to build_packages on each.

Review URL: http://codereview.chromium.org/6396006

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@73529 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build