Web: fix crash `InnerSizeWriter::request_inner_size()` (#3727) #6261

Job	Run time
Check formatting	18s
Run cargo-deny on Android	22s
Run cargo-deny on iOS	21s
Run cargo-deny on Linux	25s
Run cargo-deny on macOS	21s
Test stable Windows 64bit MSVC	2m 51s
Run cargo-deny on Redox OS	21s
Test stable Windows 32bit MSVC	1m 51s
Run cargo-deny on web	20s
Test stable Windows 64bit GNU	2m 4s
Run cargo-deny on Windows	21s
Test stable Windows 32bit GNU	2m 57s
Test stable Linux 32bit	1m 52s
Check for typos	5s
Test stable Linux 64bit	1m 40s
Test stable X11	1m 34s
Test stable Wayland	1m 29s
Test stable Android	1m 12s
Test stable Redox OS	33s
Test stable macOS	1m 4s
Test stable iOS x86_64	44s
Test stable iOS Aarch64	56s
Test stable web	58s
Test nightly Windows 64bit MSVC	2m 6s
Test nightly Windows 32bit MSVC	1m 26s
Test nightly Windows 64bit GNU	1m 52s
Test nightly Windows 32bit GNU	2m 11s
Test nightly Linux 32bit	1m 55s
Test nightly Linux 64bit	1m 31s
Test nightly X11	1m 27s
Test nightly Wayland	1m 26s
Test nightly Android	57s
Test nightly Redox OS	26s
Test nightly macOS	1m 19s
Test nightly iOS x86_64	49s
Test nightly iOS Aarch64	51s
Test nightly web	57s
Test 1.70.0 Windows 64bit MSVC	1m 15s
Test 1.70.0 Windows 32bit MSVC	1m 4s
Test 1.70.0 Windows 64bit GNU	1m 23s
Test 1.70.0 Windows 32bit GNU	1m 7s
Test 1.70.0 Linux 32bit	1m 23s
Test 1.70.0 Linux 64bit	56s
Test 1.70.0 X11	53s
Test 1.70.0 Wayland	51s
Test 1.70.0 Redox OS	27s
Test 1.70.0 macOS	36s
Test 1.70.0 iOS x86_64	38s
Test 1.70.0 iOS Aarch64	41s
Test 1.70.0 web	41s
Test 1.70.0 Android	37s
Test nightly web Atomic	1m 11s
	57m 35s

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