Permissions API: move multiple request to requestAll().
Instead of overloading navigator.permissions.request(), .requestAll()
is a clearer name and will not confuse the authors with two different
return types.
BUG=
516626
Committed:
https://crrev.com/e9b0b79b5b64ecd6df10152479c7266f24418d82
Cr-Commit-Position: refs/heads/master@{#356083}