Reduce svn bot load back to 1.

BUG=265443
TBR=cmp@chromium.org

Review URL: https://chromiumcodereview.appspot.com/20994006

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@214190 0039d316-1c4b-4281-b951-d872f2087c98

gclient.py

@@ -1750,7 +1750,7 @@ class OptionParser(optparse.OptionParser):
     # cmp: 2013/06/19
     # Temporary workaround to lower bot-load on SVN server.
     if os.environ.get('CHROME_HEADLESS') == '1':
-      jobs = 4
+      jobs = 1
 
     self.add_option(
         '-j', '--jobs', default=jobs, type='int',