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The test suite already instantiates a FieldTrialList as per
https://chromium-review.googlesource.com/c/chromium/src/+/1883567 so
it's no longer necessary to do so explicitly in tests.

This patch addresses unit tests under:
/chrome/browser/win/chrome_elf_init_unittest.cc

This CL was uploaded by git cl split.

Bug: 1018667
Change-Id: I4743155712ef4dc72ae9bde108f182d47eb5b60e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1917512Reviewed-by: Cait Phillips <caitkp@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Auto-Submit: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719195}