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It is no longer necessary to build without symbols to keep the
instrumented library size under 4G (a recent local instrumented build
with symbol_level=0 had an unstripped library size of ~500M). Removing
this custom arg will make future debugging of orderfile issues
easier as there will be fewer variations to account for.

Change-Id: I84078e7f0a2f3033031755e884c3e72049b2beed
Reviewed-on: https://chromium-review.googlesource.com/c/1317571Reviewed-by: Egor Pasko <pasko@chromium.org>
Reviewed-by: Benoit L <lizeb@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Matthew Cary <mattcary@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608302}