Remove unused JSReceiver::SetElement method

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 0d1a69cb9882985fa282c4e2f3dc4a5fa98c9523..7e62e12b5ba5119445766921199a085e54647648 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1439,14 +1439,6 @@ class JSReceiver: public HeapObject {
   MUST_USE_RESULT MaybeObject* DeleteProperty(String* name, DeleteMode mode);
   MUST_USE_RESULT MaybeObject* DeleteElement(uint32_t index, DeleteMode mode);
 
-  // Set the index'th array element.
-  // Can cause GC, or return failure if GC is required.
-  MUST_USE_RESULT MaybeObject* SetElement(uint32_t index,
-                                          Object* value,
-                                          PropertyAttributes attributes,
-                                          StrictModeFlag strict_mode,
-                                          bool check_prototype);
-
   // Tests for the fast common case for property enumeration.
   bool IsSimpleEnum();
 
@@ -8048,11 +8040,6 @@ class JSProxy: public JSReceiver {
       Object* value,
       PropertyAttributes attributes,
       StrictModeFlag strict_mode);
-  MUST_USE_RESULT MaybeObject* SetElementWithHandler(
-      JSReceiver* receiver,
-      uint32_t index,
-      Object* value,
-      StrictModeFlag strict_mode);
 
   // If the handler defines an accessor property with a setter, invoke it.
   // If it defines an accessor property without a setter, or a data property