Include field_trial_default to libjingle_nacl to enable future finch experiment in webrtc/p2p
Include field_trial_default to libjingle_nacl to enable future finch experiment in webrtc/p2p

BUG=

Review URL: https://codereview.chromium.org/1421763002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#355689}

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