Switch off secure redirect until we have a cert for gonacl.com

BUG=None
TEST=None
R=binji@chromium.org

Review URL: https://codereview.chromium.org/884523002

Cr-Commit-Position: refs/heads/master@{#313363}

native_client_sdk/src/gonacl_appengine/app.yaml

@@ -26,7 +26,6 @@ handlers:
 
 - url: /.*
   script: gonacl.application
-  secure: always
 
 skip_files:
 - src/.*