Rollback UpgradeToHttps for viewvc links

- Many chrome-internal viewvc links do not support https.  UpgradeToHttps
  was added 10 months ago  and continues to generate broken viewvc links.

Reverts part of crrev.com/9214004

BUG=107838

Review URL: https://chromiumcodereview.appspot.com/11412161

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@169815 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/git_cl.py b/git_cl.py
index 6031862..c374a10 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -349,8 +349,7 @@
 
   def GetViewVCUrl(self):
     if not self.viewvc_url:
-      self.viewvc_url = gclient_utils.UpgradeToHttps(
-          self._GetConfig('rietveld.viewvc-url', error_ok=True))
+      self.viewvc_url = self._GetConfig('rietveld.viewvc-url', error_ok=True)
     return self.viewvc_url
 
   def GetDefaultCCList(self):