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The main IsAccessAllowedInternal function has several #if blocks.
Extract the per-platform logic into IsAccessAllowedChromeOS() and
IsAccessAllowAndroid() helper functions.

This simplifies the #if blocks in the main function, and allows
all #ifs to be positive-sense (no !defined anymore).

No functional changes -- this is just cleanup before I add yet
another #if for lacros.

Bug: 1150934
Test: existing unit_tests
Change-Id: Ic0fb5ad7cc2d8b1d566c12baf8a7c8cb0d8898f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2568813
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832684}