Remove unused GetConstructor

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 41beca4d8a64f658ac39a3e32cbf0c180352b599..1ae95807740d4ce5abbb4bccef773efabcd9ce2d 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1640,9 +1640,6 @@ class JSReceiver: public HeapObject {
   MUST_USE_RESULT static inline Maybe<PropertyAttributes>
       GetOwnElementAttribute(Handle<JSReceiver> object, uint32_t index);
 
-  // Return the constructor function (may be Heap::null_value()).
-  inline Object* GetConstructor();
-
   // Retrieves a permanent object identity hash code. The undefined value might
   // be returned in case no hash was created yet.
   inline Object* GetIdentityHash();