Remove PostCrossThreadBind variant that operates over repeating callbacks

All users have been switched to using the variant of PostCrossThreadTask
and PostDelayedCrossThreadTask that operate on WTF's once-callbacks
(aka CrossThreadOnceFunction).

BUG=963574
R=haraken@chromium.org, hiroshige@chromium.org

Change-Id: I2ff3732924192f910ae26b810353efa84eafaf0f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1626489
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686681}
1 file changed