Backed out changeset beded14a92c5 (bug 1270317)

testing/mozharness/scripts/fx_desktop_build.py

@@ -56,6 +56,7 @@ class FxDesktopBuild(BuildScript, object):
                 'taskcluster_credentials_file': 'oauth.txt',
                 'periodic_clobber': 168,
                 # hg tool stuff
+                'default_vcs': 'hgtool',
                 "tools_repo": "https://hg.mozilla.org/build/tools",
                 "repo_base": "https://hg.mozilla.org",
                 'tooltool_url': 'https://api.pub.build.mozilla.org/tooltool/',