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This change assigns:
  enable-navigation-tracing
  trace-upload-url
to tracing@ and marks them to expire in M80.

Bug: None
Change-Id: Ie28496728d26409ca979a08d2a33db9999c143c9
Reviewed-on: https://chromium-review.googlesource.com/c/1475808
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: oysteine <oysteine@chromium.org>
Auto-Submit: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: oysteine <oysteine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632733}