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Due to rare case of install_static::GetUserDataDir() path expansion,
this API cannot be used inside DllMain().  The full, expanded path to
the packed blacklist file will be dropped into install_static::GetRegistryPath(),
in the kThirdPartyRegKeyName subkey, in the kBlFilePathRegValue REG_SZ value.
This has no other impact on existing functionality.

- This change includes comments, constants, and tests.

- LogLoadAttempt() will now include the section path for any 'blocked' logs
as well.  Friendly reminder that log.AddEntry() will still not add duplicate
'blocked' logs, to protect against spammy logging.

- Removed old bit of uninstaller touching old blacklist.

Test: chrome_elf_unittests.exe, ThirdParty*
Bug: 769590
Change-Id: Id9ada49215aa110db9fb72a4712da9d3fb7ccf31
Reviewed-on: https://chromium-review.googlesource.com/1109600Reviewed-by: Robert Shield <robertshield@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Penny MacNeil <pennymac@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570849}