Roll swarming_client @ 3ae9e6e79206d6b0d530ab98ce941c9dc9a19d5b.

$ git log 7124e396edf..3ae9e6e792 --date=short --format="%ad %ae %s" | sed 's/@chromium\.org//'
2014-01-13 maruel Add support for free variable in .isolate file format.
2014-01-10 maruel Make short_expression_finder.py a bit more readable.
2014-01-10 maruel Make Configs.config_variables read-only.
2014-01-10 maruel Remove ConfigSettings.config and Configs.merge_dependency().

R=vadimsh@chromium.org
BUG=swarming:61
BUG=swarming:63

Review URL: https://codereview.chromium.org/137363002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244628 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244629 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244629