Update sizeviewer readme to use secure URL

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

tools/win/sizeviewer/README.chromium

-code_tally.exe binary from
-http://syzygy-archive.commondatastorage.googleapis.com/index.html?path=builds/official/1626/
+code_tally.exe binary is in the experimental folder in binaries.zip, available
+at:
+https://syzygy-archive.commondatastorage.googleapis.com/index.html?path=builds/official/1626/
 
 favicon.png is chart_pie.png unmodified from
 http://www.famfamfam.com/lab/icons/silk/