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After this CL, the rewriter will detect fields that are initialized
with non-nullptr value in constexpr constructors.  Such fields will
be emitted as candidates for exclusion via --exclude-fields cmdline
parameter.

This CL should help ensure that the build is successful, once we
stop excluding |const char* fields| from the rewrite.  In particular,
performance_manager::PriorityAndReason::reason_ field needs to be
excluded in practice.  Additionally, this CL should help to automate
excluding of the various base::FeatureParam fields/scenarios (they
are currently covered via manual-fields-to-ignore.txt).

Bug: 1069567
Change-Id: I122a329577f77d8172e26f189b5155af742a33c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495719
Auto-Submit: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820840}