Some cleanup fixes

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index fd361fc7a4655709385ab0f560b750caf8990c8a..573c5129f7a5d7a89d4fa285642882816313454f 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -666,10 +666,9 @@ class Heap {
   // Returns a deep copy of the JavaScript object.
   // Properties and elements are copied too.
   // Returns failure if allocation failed.
-  MUST_USE_RESULT MaybeObject* CopyJSObject(JSObject* source);
-
-  MUST_USE_RESULT MaybeObject* CopyJSObjectWithAllocationSite(
-      JSObject* source, AllocationSite* site);
+  // Optionally takes an AllocationSite to be appended in an AllocationMemento.
+  MUST_USE_RESULT MaybeObject* CopyJSObject(JSObject* source,
+                                            AllocationSite* site = NULL);
 
   // Allocates the function prototype.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation