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When a file descriptor is opened by the base::File, all calls to close(3) from the same dynamic library will hit a CHECK unless they are made from a whitelist of callsites belonging to base::File.

There is a handy protect_file_posix.gypi introduced to make it easy to enable on Chrome-for-Android.

This 'linker magic' is somewhat crazy, so:
1. it will be *removed *when crbug.com/424562 is fixed
2. it should only be used by a whitelist of binaries/libraries (in the opensource part: libchromeshell only)

BUG=424562

Review URL: https://codereview.chromium.org/676873004

Cr-Commit-Position: refs/heads/master@{#304592}