Remove performance.shouldYield implementation

performance.shouldYield was replaced by navigator.scheduling.isInputPending.

Bug: 910421
Change-Id: I5a1b63e8faa3b77709123c184ab5278801ad6b27
Reviewed-on: https://chromium-review.googlesource.com/c/1453369
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Andrew Comminos <acomminos@fb.com>
Cr-Commit-Position: refs/heads/master@{#629315}
15 files changed