Pass empty email & password to ReadOnlyRietveld in dry run of commit queue

This avoids requiring real Rietveld credentials or specifying empty
user name on the command line (which is counterintuitive).

It also additionally ensures that nothing on Rietveld will change, even if there is a bug in ReadOnlyRietveld wrapper.

BUG=none

Review URL: https://codereview.chromium.org/145173004

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/commit-queue@246483 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/commit_queue.py b/commit_queue.py
index 8bb63ac..fce6c33 100755
--- a/commit_queue.py
+++ b/commit_queue.py
@@ -224,12 +224,10 @@
         parser.error('--only-issue is not supported with dry run')
       else:
         print('Using read-only Rietveld')
-      # Make sure rietveld is not modified.
-      rietveld_obj = rietveld.ReadOnlyRietveld(
-          url,
-          options.user,
-          gaia_creds.get(options.user),
-          None)
+      # Make sure rietveld is not modified. Pass empty email and
+      # password to bypass authentication; this additionally
+      # guarantees rietveld will not allow any changes.
+      rietveld_obj = rietveld.ReadOnlyRietveld(url, email='', password='')
     else:
       AlertOnUncleanCheckout()
       print('WARNING: The Commit Queue is going to commit stuff')
diff --git a/workdir/README b/workdir/README
index ee3fc87..a91c825 100644
--- a/workdir/README
+++ b/workdir/README
@@ -8,5 +8,5 @@
   svn.chromium.org.
 * .googlecode_svn_pwd file to be able to access the subversion server at
   code.google.com.
-* .chromium_status_password file to be able to access the chromium tree status
+* .chromium_status_pwd file to be able to access the chromium tree status
   app at chromium-status.appspot.com