Remove more Gecko-internal enums/dicts from WebIDL (#3723) #1579

Job	Run time
build_benchmarks	55s
Check	1m 10s
build_nightly	1m 34s
build_examples	2m 37s
Verify that web-sys is compiled correctly	51s
Clippy	2m 29s
dist_linux_aarch64_gnu	2m 44s
dist_linux_x86_64_musl	2m 42s
dist_macos_aarch64	2m 28s
dist_macos_x86_64	2m 37s
dist_windows	2m 34s
doc_api	1m 10s
doc_book	38s
Rustfmt	16s
Build and test the deno example	57s
Run js-sys crate tests	2m 17s
Run native tests	1m 57s
Run wasm-bindgen crate tests with multithreading enabled	1m 39s
Test TypeScript output of wasm-bindgen	1m 6s
Run UI compile-fail tests	2m 40s
Run wasm-bindgen crate tests (unix)	2m 10s
Run web-sys crate tests	1m 56s
Run wasm-bindgen-webidl crate tests	1m 43s
test_examples	1s
deploy	1s
	41m 12s

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