Let ReadOnlyRietveld access the password.

The commit queue can't successfully run presubmit checks on top of
ReadOnlyRietveld because it requires access to the password field to pass
through to presubmit_shim.

R=phajdan.jr@chromium.org

Review URL: https://codereview.chromium.org/197213003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@259611 0039d316-1c4b-4281-b951-d872f2087c98

rietveld.py

@@ -517,6 +517,10 @@ class ReadOnlyRietveld(object):
   def email(self):
     return self._rietveld.email
 
+  @property
+  def password(self):
+    return self._rietveld.password
+
   def get_pending_issues(self):
     pending_issues = self._rietveld.get_pending_issues()