LibWeb: Propogate OOM errors from readable_stream_reader_generic_cancel

Userland/Libraries/LibWeb/Streams/AbstractOperations.cpp

@@ -242,7 +242,7 @@ void readable_stream_add_read_request(ReadableStream& stream, ReadRequest const&
 }
 
 // https://streams.spec.whatwg.org/#readable-stream-reader-generic-cancel
-JS::NonnullGCPtr<WebIDL::Promise> readable_stream_reader_generic_cancel(ReadableStreamGenericReaderMixin& reader, JS::Value reason)
+WebIDL::ExceptionOr<JS::NonnullGCPtr<WebIDL::Promise>> readable_stream_reader_generic_cancel(ReadableStreamGenericReaderMixin& reader, JS::Value reason)
 {
     // 1. Let stream be reader.[[stream]]
     auto stream = reader.stream();
@@ -251,7 +251,7 @@ JS::NonnullGCPtr<WebIDL::Promise> readable_stream_reader_generic_cancel(Readable
     VERIFY(stream);
 
     // 3. Return ! ReadableStreamCancel(stream, reason)
-    return MUST(readable_stream_cancel(*stream, reason));
+    return TRY(readable_stream_cancel(*stream, reason));
 }
 
 // https://streams.spec.whatwg.org/#readable-stream-reader-generic-initialize

Userland/Libraries/LibWeb/Streams/AbstractOperations.h

@@ -33,7 +33,7 @@ void readable_stream_fulfill_read_request(ReadableStream&, JS::Value chunk, bool
 size_t readable_stream_get_num_read_requests(ReadableStream&);
 bool readable_stream_has_default_reader(ReadableStream&);
 
-JS::NonnullGCPtr<WebIDL::Promise> readable_stream_reader_generic_cancel(ReadableStreamGenericReaderMixin&, JS::Value reason);
+WebIDL::ExceptionOr<JS::NonnullGCPtr<WebIDL::Promise>> readable_stream_reader_generic_cancel(ReadableStreamGenericReaderMixin&, JS::Value reason);
 void readable_stream_reader_generic_initialize(ReadableStreamGenericReaderMixin&, ReadableStream&);
 WebIDL::ExceptionOr<void> readable_stream_reader_generic_release(ReadableStreamGenericReaderMixin&);
 

Userland/Libraries/LibWeb/Streams/ReadableStreamGenericReader.cpp

@@ -32,7 +32,7 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::Promise>> ReadableStreamGenericReaderMi
     }
 
     // 2. Return ! ReadableStreamReaderGenericCancel(this, reason).
-    auto promise_capability = readable_stream_reader_generic_cancel(*this, reason);
+    auto promise_capability = TRY(readable_stream_reader_generic_cancel(*this, reason));
     return JS::NonnullGCPtr { verify_cast<JS::Promise>(*promise_capability->promise().ptr()) };
 }