LibWeb: Remove exceptional return types from infallible stream IDL

Author: https://github.com/trflynn89
Commit: 2d4d16ac37
Pull-request: https://github.com/SerenityOS/serenity/pull/24165
Reviewed-by: https://github.com/kennethmyhra ✅
Reviewed-by: https://github.com/shannonbooth ✅

Userland/Libraries/LibWeb/Streams/ReadableStreamBYOBReader.h

@@ -45,7 +45,7 @@ public:
 
     virtual ~ReadableStreamBYOBReader() override = default;
 
-    WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::Promise>> read(JS::Handle<WebIDL::ArrayBufferView>&);
+    JS::NonnullGCPtr<JS::Promise> read(JS::Handle<WebIDL::ArrayBufferView>&);
 
     void release_lock();