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LLD currently ignores /PROFILE, so it does not enable /OPT:ICF and
/OPT:REF for chrome_elf.dll. chrome_elf_import_unittests checks that the
linker strips dead dependencies on user32.dll and shell32.dll, so it
currently fails when chrome_elf.dll is linked with LLD.

I will fix this bug in upstream LLD, but in the meantime this will fix
the issue. This change also seens like it is more explicit and reduces
gn complexity, so maybe we should leave it like this after the LLD fix.

R=brucedawson@chromium.org, thakis@chromium.org

Bug: chromium:827075
Change-Id: Icd2a09aab031b7ff07738892c12a5de1ec9936b9
Reviewed-on: https://chromium-review.googlesource.com/986694
Commit-Queue: Reid Kleckner <rnk@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547105}