Refactor webrtc/modules/utility for gn check
Refactor webrtc/modules/utility for gn check

The now checked target is:
"//webrtc/modules/utility/*"

BUG=webrtc:6828
NOTRY=True

Review-Url: https://codereview.webrtc.org/2606483002
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#15803}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 05afa8bce69c99a57c8ad5173c9a89b982cd20c6

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