Use effectivePreloadType() where possible

preloadType() is still used in two places where it ideally should not,
HTMLMediaElement::setPlayerPreload and HTMLMediaElement::seek, but
changing those would probably be observable and need tests.

Drive-by: Drop two unused HTMLMediaElement state bits

R=fs@opera.com

Review URL: https://codereview.chromium.org/1687793002

Cr-Commit-Position: refs/heads/master@{#374897}
2 files changed