Revert "Allow Chrome to optimize for…in loop in animate()"
Revert "Allow Chrome to optimize for…in loop in animate()"

This reverts commit cabe8f42e63151a8ca5a6d47a5751e28a3f97fd9.

1modm/TimelineJS,anxintiancai/TimelineJS,deenjohn/TimelineJS,pom95/timeline,zstao/TimelineJS,ryekee/TimelineJS,deenjohn/TimelineJS,ryekee/TimelineJS,pom95/timeline,stea4lth/TimelineJS,djaney/TimelineJS,JoaquinSiabra/TimelineJS,james-logan/TimelineJS,deenjohn/TimelineJS,noikiy/TimelineJS,noikiy/TimelineJS,JoaquinSiabra/TimelineJS,NUKnightLab/TimelineJS,ycaihua/TimelineJS,1modm/TimelineJS,NUKnightLab/TimelineJS,zstao/TimelineJS,noikiy/TimelineJS,1modm/TimelineJS,LauraHilliger/TimelineJS,landsurveyorsunited/TimelineJS,djaney/TimelineJS,ycaihua/TimelineJS,james-logan/TimelineJS,zstao/TimelineJS,LauraHilliger/TimelineJS,stea4lth/TimelineJS,stea4lth/TimelineJS,anxintiancai/TimelineJS,pom95/timeline,djaney/TimelineJS,NUKnightLab/TimelineJS,landsurveyorsunited/TimelineJS,anxintiancai/TimelineJS,james-logan/TimelineJS,landsurveyorsunited/TimelineJS,ycaihua/TimelineJS,ryekee/TimelineJS,JoaquinSiabra/TimelineJS,LauraHilliger/TimelineJS