Delete unused code for exclusive access permission prompting.
On all platforms and flag configurations (except Android, which is not
covered in this CL), we no longer prompt for fullscreen / mouse lock
permission. Therefore, all of the prompting infrastructure is dead code
and can now be safely deleted. This change should not have any
observable effect.
BUG=
610900
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:closure_compilation
Committed:
https://crrev.com/b6adb5143ab0cc79a64c64a42f965bbc595ab14c
Cr-Commit-Position: refs/heads/master@{#398504}