Remove unnecessary %UnwrapGlobalProxy calls from object-observe.js

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index f2e2650ce7d9e7c7c5a6d1c266a8ffead5f8e24a..d20d3f12af594905b96119ba115965c906b8847f 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -14951,18 +14951,6 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_ObservationWeakMapCreate) {
 }
 
 
-RUNTIME_FUNCTION(MaybeObject*, Runtime_UnwrapGlobalProxy) {
-  SealHandleScope shs(isolate);
-  ASSERT(args.length() == 1);
-  Object* object = args[0];
-  if (object->IsJSGlobalProxy()) {
-    object = object->GetPrototype(isolate);
-    if (object->IsNull()) return isolate->heap()->undefined_value();
-  }
-  return object;
-}
-
-
 RUNTIME_FUNCTION(MaybeObject*, Runtime_IsAccessAllowedForObserver) {
   HandleScope scope(isolate);
   ASSERT(args.length() == 3);