[styles] Fix Symbol() usage in IE11

[aditya1906]

Fixes #15833

[mui-pr-bot]

Details of bundle changes.

Comparing: c48ee61...d4b1463

bundle	parsed diff	gzip diff	prev parsed	current parsed	prev gzip	current gzip
@material-ui/core	+0.02% 🔺	+0.02% 🔺	315,678	315,731	86,445	86,462
@material-ui/core/Paper	+0.08% 🔺	+0.12% 🔺	67,870	67,923	20,158	20,182
@material-ui/core/Paper.esm	+0.09% 🔺	+0.11% 🔺	61,152	61,205	18,948	18,969
@material-ui/core/Popper	0.00%	0.00%	28,740	28,740	10,346	10,346
@material-ui/core/Textarea	0.00%	0.00%	5,513	5,513	2,376	2,376
@material-ui/core/TrapFocus	0.00%	0.00%	3,744	3,744	1,575	1,575
@material-ui/core/styles/createMuiTheme	0.00%	0.00%	15,960	15,960	5,781	5,781
@material-ui/core/useMediaQuery	0.00%	0.00%	2,106	2,106	975	975
@material-ui/lab	+0.04% 🔺	+0.04% 🔺	138,808	138,861	42,625	42,642
@material-ui/styles	+0.10% 🔺	+0.15% 🔺	51,353	51,406	15,176	15,199
@material-ui/system	0.00%	0.00%	14,458	14,458	4,181	4,181
Button	+0.06% 🔺	+0.06% 🔺	83,816	83,869	25,443	25,459
Modal	0.00%	0.00%	20,344	20,344	6,681	6,681
colorManipulator	0.00%	0.00%	3,904	3,904	1,543	1,543
docs.landing	0.00%	0.00%	55,991	55,991	14,061	14,061
docs.main	+0.03% 🔺	+0.04% 🔺	645,071	645,243	202,900	202,990
packages/material-ui/build/umd/material-ui.production.min.js	+0.02% 🔺	+0.03% 🔺	294,598	294,651	83,939	83,964

Generated by 🚫 dangerJS against d4b1463

Updated

[aditya1906]

I have updated the changes. Can it be merged now to the master branch?

[oliviertassinari]

@aditya1906 Well done, contributing to OSS is easy :).

[aditya1906]

Thank you @oliviertassinari and @eps1lon . And definitely learning a lot from Open Source Projects(and contribute to it) like material-ui. Thank you so much for your guidance, I highly appreciate it.
And I'm definitely looking forward to contribute more and more to your project.