Removes noisy dependencies on webrtc_fuzzer_main and removal of find_bad_constructs, removes 1-6 lines of gn per fuzzer target. BUG=webrtc:4771 R=kjellander@webrtc.org Review URL: https://codereview.webrtc.org/1524993002 . Cr-Commit-Position: refs/heads/master@{#11022}