[heap] Simplify adjusting of live bytes.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 4451444fe9f4a0fcf704096ee49290e46ea83b85..dadee9af50fd97269451ee8ce3a4b55ca3348df5 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -3436,8 +3436,7 @@ void Isolate::CheckDetachedContextsAfterGC() {
   if (new_length == 0) {
     heap()->set_detached_contexts(heap()->empty_fixed_array());
   } else if (new_length < length) {
-    heap()->RightTrimFixedArray<Heap::CONCURRENT_TO_SWEEPER>(
-        *detached_contexts, length - new_length);
+    heap()->RightTrimFixedArray(*detached_contexts, length - new_length);
   }
 }