When WEBRTC_EXCLUDE_FIELD_TRIAL_DEFAULT is defined, only
webrtc::field_trial::FindFullName should be defined at link time, the
other functions should not be part of this interface.
No-Try: True
Bug: webrtc:10335
Change-Id: I81bcefcde6a51bcf8e410af91b5401f23e039d50
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/255340
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36191}