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We want to keep minimal symbols when remove_webcore_debug_symbols is
set, so that we can get readable backtrace.

On ChromeOS arm build, the size of debug file increases from
899MB to 1.244GB. It increases 245 MB.

Bug: chromium:792999
Change-Id: Ibc238308754a2727505cfbac3ce24f7a70027529
Reviewed-on: https://chromium-review.googlesource.com/862607Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Commit-Queue: Yunlian Jiang <yunlian@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532545}