Update sizeviewer readme to use secure URL

Change-Id: I94a3e7c5f8e89e2d2080024755cdc4a5f87ad92f
Reviewed-on: https://chromium-review.googlesource.com/c/1437396
Reviewed-by: David Bienvenu <davidbienvenu@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#626158}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 6f541d44ec7bab80c3d41ce40fb4d85c2bb6ddb7
1 file changed