Remove enableUserBlockingEvents flag

[sebmarkbage]

Seems like this worked out. We can clean up the flag now.

[sizebot]

ReactDOM: size: 0.0%, gzip: 0.0%

Details of bundled changes.

Comparing: 0d8c0cd...4e0d866

react-dom

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-dom.profiling.min.js	+0.1%	+0.1%	120.78 KB	120.86 KB	38.02 KB	38.05 KB	NODE_PROFILING
react-dom-server.browser.development.js	-0.1%	-0.2%	142.24 KB	142.07 KB	37.14 KB	37.05 KB	UMD_DEV
ReactDOM-dev.js	-0.0%	-0.0%	978.71 KB	978.42 KB	216.11 KB	216.06 KB	FB_WWW_DEV
react-dom-server.browser.production.min.js	0.0%	0.0%	19.86 KB	19.86 KB	7.37 KB	7.37 KB	UMD_PROD
react-dom-test-utils.development.js	-0.3%	-0.4%	57.53 KB	57.36 KB	15.83 KB	15.76 KB	UMD_DEV
react-dom-unstable-fizz.browser.development.js	0.0%	+0.1%	3.78 KB	3.78 KB	1.53 KB	1.53 KB	UMD_DEV
react-dom-test-utils.production.min.js	0.0%	0.0%	11.19 KB	11.19 KB	4.16 KB	4.16 KB	UMD_PROD
react-dom-unstable-fizz.browser.production.min.js	0.0%	🔺+0.3%	1.2 KB	1.2 KB	700 B	702 B	UMD_PROD
react-dom-test-utils.development.js	-0.3%	-0.4%	55.81 KB	55.64 KB	15.5 KB	15.43 KB	NODE_DEV
react-dom-unstable-fizz.browser.development.js	0.0%	+0.1%	3.61 KB	3.61 KB	1.48 KB	1.48 KB	NODE_DEV
react-dom-test-utils.production.min.js	0.0%	🔺+0.1%	10.96 KB	10.96 KB	4.09 KB	4.09 KB	NODE_PROD
react-dom-unstable-fizz.browser.production.min.js	0.0%	🔺+0.2%	1.04 KB	1.04 KB	632 B	633 B	NODE_PROD
react-dom.development.js	-0.0%	-0.1%	953.57 KB	953.11 KB	215.16 KB	215.05 KB	UMD_DEV
react-dom.production.min.js	0.0%	0.0%	117.07 KB	117.09 KB	37.7 KB	37.72 KB	UMD_PROD
react-dom.profiling.min.js	0.0%	+0.1%	120.61 KB	120.63 KB	38.71 KB	38.73 KB	UMD_PROFILING
react-dom.development.js	-0.0%	-0.1%	947.62 KB	947.16 KB	213.63 KB	213.51 KB	NODE_DEV
react-dom-server.node.development.js	-0.1%	-0.2%	139.19 KB	139.02 KB	36.36 KB	36.29 KB	NODE_DEV
react-dom.production.min.js	🔺+0.1%	0.0%	117.09 KB	117.17 KB	36.96 KB	36.97 KB	NODE_PROD
ReactDOM-prod.js	0.0%	0.0%	391.82 KB	391.82 KB	71.36 KB	71.36 KB	FB_WWW_PROD
react-dom-server.browser.development.js	-0.1%	-0.2%	138.17 KB	138 KB	36.13 KB	36.06 KB	NODE_DEV
react-dom-server.browser.production.min.js	0.0%	0.0%	19.79 KB	19.79 KB	7.36 KB	7.36 KB	NODE_PROD
react-dom-unstable-native-dependencies.development.js	0.0%	0.0%	60.73 KB	60.73 KB	15.85 KB	15.85 KB	UMD_DEV
react-dom-unstable-native-dependencies.production.min.js	0.0%	🔺+0.1%	10.74 KB	10.74 KB	3.67 KB	3.67 KB	UMD_PROD
ReactDOMServer-dev.js	0.0%	0.0%	142.09 KB	142.09 KB	35.6 KB	35.6 KB	FB_WWW_DEV
ReactDOMServer-prod.js	0.0%	0.0%	48.24 KB	48.24 KB	11.04 KB	11.04 KB	FB_WWW_PROD
react-dom-unstable-native-dependencies.development.js	0.0%	0.0%	60.4 KB	60.4 KB	15.72 KB	15.73 KB	NODE_DEV
react-dom-unstable-fizz.node.development.js	0.0%	+0.1%	3.87 KB	3.87 KB	1.51 KB	1.51 KB	NODE_DEV
react-dom-unstable-native-dependencies.production.min.js	0.0%	🔺+0.1%	10.49 KB	10.49 KB	3.57 KB	3.57 KB	NODE_PROD
react-dom-unstable-fizz.node.production.min.js	0.0%	🔺+0.2%	1.1 KB	1.1 KB	666 B	667 B	NODE_PROD

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