LibJS+LibWeb: Replace JS::Utf16String with AK::Utf16String

Author: https://github.com/trflynn89
Commit: a43cb15e81
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5388
Reviewed-by: https://github.com/shannonbooth ✅

Libraries/LibJS/CMakeLists.txt

@@ -245,7 +245,6 @@ set(SOURCES
     Runtime/TypedArrayConstructor.cpp
     Runtime/TypedArrayPrototype.cpp
     Runtime/Uint8Array.cpp
-    Runtime/Utf16String.cpp
     Runtime/Value.cpp
     Runtime/VM.cpp
     Runtime/WeakMap.cpp