Add test for git-svn with submodule/merge layout.

Review URL: https://chromiumcodereview.appspot.com/10543151

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@142479 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/tests/git_cl_test.py b/tests/git_cl_test.py
index fe4d54d..7e90140 100755
--- a/tests/git_cl_test.py
+++ b/tests/git_cl_test.py
@@ -148,7 +148,7 @@
       ((['git', 'config', 'branch.working.merge'],), 'refs/heads/master'),
       ((['git', 'config', 'branch.working.remote'],), 'origin'),
       ((['git', 'rev-list', '--merges',
-         '--grep="^SVN changes up to revision [0-9]*$"',
+         '--grep=^SVN changes up to revision [0-9]*$',
          'refs/remotes/origin/master^!'],), ''),
       ((['git', 'update-index', '--refresh', '-q'],), ''),
       ((['git', 'diff-index', 'HEAD'],), ''),