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This will allow tests built with is_official_build=true to produce symbolized
stack traces during failures by explicitly setting exclude_unwind_tables
to false. This will be used by the chrome-branded + is_official testers that
have been spun up on https://ci.chromium.org/p/chrome/g/chrome/console

Note that any official build that doesn't touch exclude_unwind_tables will still
have unsymbolized stack traces since exclude_unwind_tables defaults to true
for official builds:
https://source.chromium.org/chromium/chromium/src/+/master:build/config/compiler/compiler.gni;l=96

Consequently, every other official builder will still have this symbolizing
code excluded from the build products.

Bug: 1041069
Change-Id: I937dbe01c38a29b1aff01d471807a9a492109645
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2001749Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732830}