GN: Set WEBRTC_RESTRICT_LOGGING as is set in GYP.
GN: Set WEBRTC_RESTRICT_LOGGING as is set in GYP.

In GYP the define is set when we build with chrome, but it's always set
in GN.

NOTRY=True
BUG=webrtc:6312

Review-Url: https://codereview.webrtc.org/2313913002
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#14086}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: edaa4a45ef6cb516c3c205cc001650408542e367

Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk