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This patch removes the Presentation API from insecure contexts.  The number of presentations started on insecure contexts is 0.0001% of page views on desktop and 0.0004 on Android.

In addition it updates layout tests and WPT to use https: for presentation URLs.

Blink-dev thread:
https://groups.google.com/a/chromium.org/d/topic/blink-dev/lumj0lVdtHA/discussion

chromestatus.com feature entry:
https://www.chromestatus.com/feature/5766218384408576

Bug: 733381
Change-Id: I9ae3025160b0e0bcf987fda0068a0e6bd92c24fd
Reviewed-on: https://chromium-review.googlesource.com/c/1306336Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: mark a. foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604621}