chromium: Remove `enable_js_type_check=false` GN arg

[MaxIhlenfeldt]

Build and patch changes:

https://crrev.com/c/4210955 made enable_js_type_check Ash-only, so we don't need to set it so false any more.

License changes:

None.

Test-built:

• chromium-ozone-wayland:
  • nanbield, clang, MACHINE=qemuarm64