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It turns out isolates built on Mac builds that enable_dsyms didn't
include the symbols in the .dSYM/ directories for frameworks, apps,
and plugins.

This CL fixes that.

R=bpastene@chromium.org, rsesek@chromium.org
BUG=961548

Change-Id: I60f27e7e51235cac6d4fa3c5b7c6de11c0b97819
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1671667Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671463}