Introduce new ppapi::PERMISSION_DEFAULT

Provide a single item to update to ensure backwards compatibility
when ppapi permissions become finer-grained over time.

No functional change, just a refactoring prior to fixing the
linked issue.

Bug: 948172
Change-Id: I500292ef01a31d6c6dd922b9f70a4565b3e62f11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1549342
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Mark Seaborn <mseaborn@chromium.org>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#647832}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 5a21691ed8b4ff1aac5b49e35397f4f032f5fd07
1 file changed