[Scheduler] Delete old rAF implementation

[acdlite]

We've been using the message loop version for a while. Time to delete.

[codesandbox-ci]

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Latest deployment of this branch, based on commit 0b8b5b8:

Sandbox	Source
hidden-tree-dkq11	Configuration

[sizebot]

Size changes (experimental)

React: size: -0.1%, gzip: -0.4%

Details of bundled changes.

Comparing: 6dc2734...0b8b5b8

react

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react.development.js	-3.9%	-3.9%	117.69 KB	113.05 KB	29.88 KB	28.7 KB	UMD_DEV
react.production.min.js	-0.1%	-0.4%	12.54 KB	12.52 KB	4.92 KB	4.9 KB	UMD_PROD
React-prod.js	0.0%	0.0%	17.75 KB	17.75 KB	4.62 KB	4.62 KB	FB_WWW_PROD
React-profiling.js	0.0%	0.0%	17.75 KB	17.75 KB	4.62 KB	4.62 KB	FB_WWW_PROFILING
react.profiling.min.js	-0.0%	-0.1%	16.05 KB	16.05 KB	6.01 KB	6.01 KB	UMD_PROFILING

scheduler

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
scheduler.development.js	-15.7%	-16.0%	29.72 KB	25.06 KB	7.67 KB	6.45 KB	NODE_DEV
scheduler.production.min.js	-0.1%	-0.1%	5.02 KB	5.01 KB	2.01 KB	2.01 KB	NODE_PROD
Scheduler-dev.js	-15.8%	-16.0%	30.26 KB	25.49 KB	7.77 KB	6.53 KB	FB_WWW_DEV
Scheduler-prod.js	-0.6%	-0.3%	12.61 KB	12.53 KB	3.06 KB	3.05 KB	FB_WWW_PROD
Scheduler-profiling.js	-0.4%	-0.1%	17.19 KB	17.12 KB	3.96 KB	3.95 KB	FB_WWW_PROFILING
scheduler-tracing.production.min.js	0.0%	-1.3%	741 B	741 B	395 B	390 B	NODE_PROD
scheduler-unstable_mock.development.js	-0.0%	-0.0%	22.67 KB	22.67 KB	5.39 KB	5.39 KB	UMD_DEV
scheduler-tracing.profiling.min.js	0.0%	-0.1%	3.26 KB	3.26 KB	1002 B	1001 B	NODE_PROFILING
scheduler-unstable_mock.production.min.js	0.0%	-0.0%	4.75 KB	4.75 KB	1.99 KB	1.99 KB	UMD_PROD
scheduler-unstable_mock.development.js	-0.0%	-0.0%	22.48 KB	22.48 KB	5.33 KB	5.33 KB	NODE_DEV
scheduler-unstable_mock.production.min.js	0.0%	-0.1%	4.74 KB	4.74 KB	1.93 KB	1.93 KB	NODE_PROD

Generated by 🚫 dangerJS against 0b8b5b8

[sizebot]

Size changes (stable)

React: size: -0.1%, gzip: -0.4%

Details of bundled changes.

Comparing: 6dc2734...0b8b5b8

react

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react.development.js	-3.9%	-3.9%	117.67 KB	113.02 KB	29.87 KB	28.69 KB	UMD_DEV
react.production.min.js	-0.1%	-0.4%	12.32 KB	12.31 KB	4.85 KB	4.83 KB	UMD_PROD
react.profiling.min.js	-0.0%	-0.1%	15.83 KB	15.83 KB	5.94 KB	5.94 KB	UMD_PROFILING

scheduler

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
scheduler-unstable_mock.development.js	-0.0%	-0.1%	22.66 KB	22.66 KB	5.39 KB	5.38 KB	UMD_DEV
scheduler-unstable_mock.production.min.js	0.0%	-0.0%	4.73 KB	4.73 KB	1.98 KB	1.98 KB	UMD_PROD
scheduler.development.js	-15.7%	-16.0%	29.71 KB	25.05 KB	7.67 KB	6.44 KB	NODE_DEV
scheduler.production.min.js	-0.1%	-0.2%	5 KB	5 KB	2 KB	2 KB	NODE_PROD
scheduler-unstable_mock.development.js	-0.0%	-0.0%	22.47 KB	22.47 KB	5.33 KB	5.33 KB	NODE_DEV
scheduler-tracing.development.js	0.0%	0.0%	11.32 KB	11.32 KB	2.85 KB	2.86 KB	NODE_DEV
scheduler-unstable_mock.production.min.js	0.0%	-0.1%	4.72 KB	4.72 KB	1.92 KB	1.92 KB	NODE_PROD
scheduler-tracing.production.min.js	0.0%	-0.3%	728 B	728 B	383 B	382 B	NODE_PROD
scheduler-tracing.profiling.min.js	0.0%	-0.1%	3.25 KB	3.25 KB	993 B	992 B	NODE_PROFILING

Generated by 🚫 dangerJS against 0b8b5b8

[adasq]

What is the reason of removing rAF?