Web: Remove some unnecessary compatibility code #6375

Job	Run time
Check formatting	10s
Minimize JavaScript	9s
Run cargo-deny on Android	19s
Run cargo-deny on iOS	23s
Check for typos	5s
Run cargo-deny on Linux	19s
Test stable Windows 64bit MSVC	2m 38s
Run cargo-deny on macOS	20s
Test stable Windows 32bit MSVC	2m 53s
Run cargo-deny on Redox OS	21s
Test stable Windows 64bit GNU	2m 19s
Run cargo-deny on web	24s
Test stable Windows 32bit GNU	2m 26s
Run cargo-deny on Windows	22s
Test stable Linux 32bit	1m 53s
Test stable Linux 64bit	1m 47s
Test stable X11	1m 32s
Test stable Wayland	1m 31s
Test stable Android	1m 1s
Test stable Redox OS	28s
Test stable macOS	52s
Test stable iOS x86_64	48s
Test stable iOS Aarch64	57s
Test stable web	56s
Test nightly Windows 64bit MSVC	1m 21s
Test nightly Windows 32bit MSVC	1m 6s
Test nightly Windows 64bit GNU	1m 57s
Test nightly Windows 32bit GNU	2m 2s
Test nightly Linux 32bit	1m 48s
Test nightly Linux 64bit	1m 40s
Test nightly X11	1m 27s
Test nightly Wayland	1m 31s
Test nightly Android	1m 6s
Test nightly Redox OS	28s
Test nightly macOS	53s
Test nightly iOS x86_64	47s
Test nightly iOS Aarch64	53s
Test nightly web	53s
Test 1.73 Windows 64bit MSVC	1m 1s
Test 1.73 Windows 32bit MSVC	1m 39s
Test 1.73 Windows 64bit GNU	1m 38s
Test 1.73 Windows 32bit GNU	1m 13s
Test 1.73 Linux 32bit	1m 5s
Test 1.73 Linux 64bit	52s
Test 1.73 X11	43s
Test 1.73 Wayland	47s
Test 1.73 Redox OS	18s
Test 1.73 macOS	33s
Test 1.73 iOS x86_64	28s
Test 1.73 iOS Aarch64	31s
Test 1.73 web	40s
Test 1.73 Android	37s
Test nightly web Atomic	1m 13s
	56m 3s

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