Increase sync jobs on bots to 4

This will speed up main waterfall sync.  We can
remove this hack tomorrow if svn load is still OK.

TBR=cmp

Review URL: https://chromiumcodereview.appspot.com/17468009

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@207277 0039d316-1c4b-4281-b951-d872f2087c98

gclient.py

@@ -1698,7 +1698,7 @@ def Parser():
   # cmp: 2013/06/19
   # Temporary workaround to lower bot-load on SVN server.
   if os.environ.get('CHROME_HEADLESS') == '1':
-    jobs = 1
+    jobs = 4
   gclientfile_default = os.environ.get('GCLIENT_FILE', '.gclient')
   parser.add_option('-j', '--jobs', default=jobs, type='int',
                     help='Specify how many SCM commands can run in parallel; '