Object::GetElements() and friends maybehandlification.

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 838 matching lines @@
   // At this point we cannot create an Error object using its javascript
   // constructor.  Instead, we copy the pre-constructed boilerplate and
   // attach the stack trace as a hidden property.
   Handle<String> key = factory()->stack_overflow_string();
   Handle<JSObject> boilerplate =
       Handle<JSObject>::cast(Object::GetProperty(js_builtins_object(), key));
   Handle<JSObject> exception = JSObject::Copy(boilerplate);
   DoThrow(*exception, NULL);
 
   // Get stack trace limit.
-  Handle<Object> error = GetProperty(js_builtins_object(), "$Error");
+  Handle<Object> error =
+      GetProperty(js_builtins_object(), "$Error").ToHandleChecked();
   if (!error->IsJSObject()) return Failure::Exception();
   Handle<Object> stack_trace_limit =
-      GetProperty(Handle<JSObject>::cast(error), "stackTraceLimit");
+      GetProperty(
+          Handle<JSObject>::cast(error), "stackTraceLimit").ToHandleChecked();
   if (!stack_trace_limit->IsNumber()) return Failure::Exception();
   double dlimit = stack_trace_limit->Number();
   int limit = std::isnan(dlimit) ? 0 : static_cast<int>(dlimit);
 
   Handle<JSArray> stack_trace = CaptureSimpleStackTrace(
       exception, factory()->undefined_value(), limit);
   JSObject::SetHiddenProperty(exception,
                               factory()->hidden_stack_trace_string(),
                               stack_trace);
   return Failure::Exception();
@@ skipping 1413 matching lines @@
       Handle<JSObject> obj = factory()->NewJSObjectFromMap(map);
       JSObject::NormalizeProperties(obj, KEEP_INOBJECT_PROPERTIES, 8);
       JSObject::SetProperty(registry, name, obj, NONE, STRICT).Assert();
     }
   }
   return Handle<JSObject>::cast(factory()->symbol_registry());
 }
 
 
 } }  // namespace v8::internal