Revert revision 6555 as it causes win32 debug to fail.

src/api.cc

Index: src/api.cc
===================================================================
--- src/api.cc	(revision 6563)
+++ src/api.cc	(working copy)
@@ -2200,12 +2200,6 @@
   ENTER_V8;
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> other = Utils::OpenHandle(*that);
-  // If both obj and other are JSObjects, we'd better compare by identity
-  // immediately when going into JS builtin.  The reason is Invoke
-  // would overwrite global object receiver with global proxy.
-  if (obj->IsJSObject() && other->IsJSObject()) {
-    return *obj == *other;
-  }
   i::Object** args[1] = { other.location() };
   EXCEPTION_PREAMBLE();
   i::Handle<i::Object> result =