This CL enableds cpplint for webrtc/modules/pacing. BUG=webrtc:5460 NOTRY=true TESTED=Fixed issues reported by: find webrtc/modules/pacing -type f -name *.cc -o -name *.h | xargs cpplint.py followed by 'git cl presubmit'. Review URL: https://codereview.webrtc.org/1674423002 Cr-Commit-Position: refs/heads/master@{#11531}