Remove getIsHydrating

[gaearon]

It's not needed after D19837930.
Alternative to #18012.

[codesandbox-ci]

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No significant bundle size changes to report.

Size changes (stable)

Generated by 🚫 dangerJS against 2ce4e96

[sizebot]

Details of bundled changes.

Comparing: f727803...2ce4e96

react-dom

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-dom.profiling.min.js	0.0%	-0.0%	123.87 KB	123.87 KB	38.77 KB	38.77 KB	NODE_PROFILING
ReactDOMServer-prod.js	0.0%	0.0%	48.99 KB	48.99 KB	11.18 KB	11.18 KB	FB_WWW_PROD
react-dom-unstable-fizz.browser.development.js	0.0%	-0.1%	3.88 KB	3.88 KB	1.55 KB	1.55 KB	UMD_DEV
react-dom-test-utils.development.js	0.0%	-0.0%	55.39 KB	55.39 KB	15.6 KB	15.59 KB	UMD_DEV
react-dom-testing.profiling.min.js	0.0%	-0.0%	121.42 KB	121.42 KB	38.35 KB	38.35 KB	NODE_PROFILING
ReactDOMTesting-prod.js	0.0%	-0.0%	341.24 KB	341.24 KB	62.28 KB	62.28 KB	FB_WWW_PROD
react-dom-server.browser.development.js	0.0%	-0.0%	139.32 KB	139.32 KB	36.94 KB	36.94 KB	UMD_DEV
react-dom-test-utils.production.min.js	0.0%	-0.0%	11.21 KB	11.21 KB	4.17 KB	4.17 KB	UMD_PROD
react-dom-server.browser.production.min.js	0.0%	-0.0%	20.46 KB	20.46 KB	7.5 KB	7.5 KB	UMD_PROD
react-dom-test-utils.development.js	0.0%	-0.0%	53.66 KB	53.66 KB	15.27 KB	15.27 KB	NODE_DEV
react-dom-server.browser.development.js	0.0%	-0.0%	135.26 KB	135.26 KB	35.92 KB	35.92 KB	NODE_DEV
react-dom-test-utils.production.min.js	0.0%	-0.0%	10.99 KB	10.99 KB	4.1 KB	4.1 KB	NODE_PROD
react-dom.development.js	0.0%	-0.0%	968.93 KB	968.93 KB	217.71 KB	217.71 KB	UMD_DEV
react-dom-unstable-native-dependencies.development.js	0.0%	-0.0%	60.93 KB	60.93 KB	16.08 KB	16.08 KB	UMD_DEV
react-dom.production.min.js	0.0%	0.0%	120 KB	120 KB	38.39 KB	38.39 KB	UMD_PROD
react-dom.profiling.min.js	0.0%	0.0%	123.63 KB	123.63 KB	39.58 KB	39.59 KB	UMD_PROFILING
react-dom.development.js	0.0%	-0.0%	963.01 KB	963.01 KB	216.04 KB	216.04 KB	NODE_DEV
react-dom-unstable-native-dependencies.development.js	0.0%	-0.0%	60.63 KB	60.63 KB	16 KB	16 KB	NODE_DEV
react-dom-unstable-fizz.node.development.js	0.0%	-0.1%	4.42 KB	4.42 KB	1.65 KB	1.65 KB	NODE_DEV
react-dom-unstable-native-dependencies.production.min.js	0.0%	-0.0%	9.99 KB	9.99 KB	3.38 KB	3.38 KB	NODE_PROD
ReactDOMServer-dev.js	0.0%	-0.0%	140.41 KB	140.41 KB	35.54 KB	35.54 KB	FB_WWW_DEV
react-dom-unstable-fizz.node.production.min.js	0.0%	-0.1%	1.21 KB	1.21 KB	698 B	697 B	NODE_PROD
ReactDOM-dev.js	-0.0%	-0.2%	990.36 KB	990.33 KB	218.95 KB	218.5 KB	FB_WWW_DEV
ReactDOM-prod.js	-0.0%	-0.5%	395.74 KB	395.6 KB	72.29 KB	71.89 KB	FB_WWW_PROD
react-dom-testing.development.js	0.0%	-0.0%	966.35 KB	966.35 KB	216.73 KB	216.73 KB	UMD_DEV
ReactDOM-profiling.js	-0.0%	-0.6%	407.08 KB	406.93 KB	74.44 KB	73.98 KB	FB_WWW_PROFILING
react-dom-server.node.development.js	0.0%	-0.0%	136.37 KB	136.37 KB	36.15 KB	36.15 KB	NODE_DEV

Size changes (experimental)

Generated by 🚫 dangerJS against 2ce4e96