Revert r99735 "Change default --jobs value from 1 to 4."

It breaks upstream webkit and nacl. I'll make then both use --jobs 1 before
relanding.

TBR=dpranke@chromium.org
BUG=
TEST=


Review URL: http://codereview.chromium.org/7833051

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@99761 0039d316-1c4b-4281-b951-d872f2087c98

gclient.py

@@ -1271,7 +1271,7 @@ def GenUsage(parser, command):
 def Parser():
   """Returns the default parser."""
   parser = optparse.OptionParser(version='%prog ' + __version__)
-  parser.add_option('-j', '--jobs', default=4, type='int',
+  parser.add_option('-j', '--jobs', default=1, type='int',
                     help='Specify how many SCM commands can run in parallel; '
                           'default=%default')
   parser.add_option('-v', '--verbose', action='count', default=0,