Use HTTPS links in CheckAuthorizedAuthor

For security and privacy, change http://www.chromium.org/developers/contributing-code
link to use HTTPS.

R=dpranke@chromium.org

Bug:
Change-Id: I12d0658631d7704de1b3072f6eb840814cc6bed0
Reviewed-on: https://chromium-review.googlesource.com/702034
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>

presubmit_canned_checks.py

@@ -100,7 +100,7 @@ def CheckAuthorizedAuthor(input_api, output_api):
     return [output_api.PresubmitPromptWarning(
         ('%s is not in AUTHORS file. If you are a new contributor, please visit'
         '\n'
-        'http://www.chromium.org/developers/contributing-code and read the '
+        'https://www.chromium.org/developers/contributing-code and read the '
         '"Legal" section\n'
         'If you are a chromite, verify the contributor signed the CLA.') %
         author)]