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This resolves e.g. base_unittests not being able to find operator new,
string::string(), etc. in Debug (is_component_build=true) builds.

This matches other platforms, but was missed in creating the Fuchsia
test() template.

Bug: 750392
Change-Id: I1a7ba2988e9d991f26d392eeab670f3a100de319
Reviewed-on: https://chromium-review.googlesource.com/596520Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Scott Graham <scottmg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491208}