Part of chrome_elf cleanup.  This was never used in the wild, and
we won't need it in the foreseeable future.

Leaving beacon and emergency disable finch switch for safety.

Tests:
1) chrome_elf_unittests, chrome_elf_util_unittest.cc: BlacklistTest*
2) unit_tests, chrome_elf_init_unittest_win.cc: ChromeBlacklistTrialTest*
R=robertshield@chromium.org
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.win:win10_chromium_x64_rel_ng
BUG=631771

Review-Url: https://codereview.chromium.org/2163803003
Cr-Commit-Position: refs/heads/master@{#408269}