Remove precommit if it exists. https://github.com/google/trace-viewer/issues/932
Remove precommit if it exists.
https://github.com/google/trace-viewer/issues/932

R=dsinclair@chromium.org, petrcermak@chromium.org

Review URL: https://codereview.appspot.com/240910043

SummerLW/Perf-Insight-Report,catapult-project/catapult,scottmcmaster/catapult,zeptonaut/catapult,0x90sled/catapult,benschmaus/catapult,danbeam/catapult,catapult-project/catapult-csm,scottmcmaster/catapult,SummerLW/Perf-Insight-Report,zeptonaut/catapult,catapult-project/catapult,sahiljain/catapult,catapult-project/catapult,catapult-project/catapult-csm,SummerLW/Perf-Insight-Report,catapult-project/catapult,benschmaus/catapult,dstockwell/catapult,modulexcite/catapult,scottmcmaster/catapult,catapult-project/catapult-csm,sahiljain/catapult,0x90sled/catapult,0x90sled/catapult,benschmaus/catapult,danbeam/catapult,catapult-project/catapult-csm,modulexcite/catapult,sahiljain/catapult,benschmaus/catapult,modulexcite/catapult,catapult-project/catapult-csm,benschmaus/catapult,catapult-project/catapult-csm,SummerLW/Perf-Insight-Report,zeptonaut/catapult,SummerLW/Perf-Insight-Report,catapult-project/catapult,dstockwell/catapult,benschmaus/catapult,dstockwell/catapult,sahiljain/catapult,SummerLW/Perf-Insight-Report,sahiljain/catapult,catapult-project/catapult-csm,sahiljain/catapult,danbeam/catapult,danbeam/catapult,benschmaus/catapult,dstockwell/catapult,catapult-project/catapult,catapult-project/catapult