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Previously the wrapper script would only be used for coverage builds
that required selective instrumentation of specific files. Now it
will also be used for any coverage builds.

Since the script's job is to remove flags from files that shouldn't
have them the default_coverage config now adds to cflags even in a
CQ build.

Bug: 918215
Change-Id: I012c5732d46bf5cff9eaf8f50615739bb781cc29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1496002
Commit-Queue: Sajjad Mirza <sajjadm@google.com>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638321}