Remove (now) unused GetPropertyWithHandler.

R=cbruni@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1499573004

Cr-Commit-Position: refs/heads/master@{#32578}

src/objects.cc

@@ -4100,8 +4100,8 @@ Maybe<bool> Object::RedefineIncompatibleProperty(Isolate* isolate,
 
 
 Maybe<bool> Object::SetDataProperty(LookupIterator* it, Handle<Object> value) {
-  // Proxies are handled on the WithHandler path. Other non-JSObjects cannot
-  // have own properties.
+  // Proxies are handled elsewhere. Other non-JSObjects cannot have own
+  // properties.
   Handle<JSObject> receiver = Handle<JSObject>::cast(it->GetReceiver());
 
   // Store on the holder which may be hidden behind the receiver.

src/objects.h

@@ -9566,11 +9566,6 @@ class JSProxy: public JSReceiver {
                               Handle<JSProxy> proxy, PropertyFilter filter,
                               KeyAccumulator* accumulator);
 
-  MUST_USE_RESULT static MaybeHandle<Object> GetPropertyWithHandler(
-      Handle<JSProxy> proxy,
-      Handle<Object> receiver,
-      Handle<Name> name);
-
   MUST_USE_RESULT static Maybe<PropertyAttributes> GetPropertyAttributes(
       LookupIterator* it);