Use instance type in Object::IsErrorObject().

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
@@ skipping 1436 matching lines @@
     }
   }
   return false;
 }
 
 
 Handle<JSMessageObject> Isolate::CreateMessage(Handle<Object> exception,
                                                MessageLocation* location) {
   Handle<JSArray> stack_trace_object;
   if (capture_stack_trace_for_uncaught_exceptions_) {
-    if (Object::IsErrorObject(this, exception)) {
+    if (exception->IsJSError()) {
       // We fetch the stack trace that corresponds to this error object.
       // If the lookup fails, the exception is probably not a valid Error
       // object. In that case, we fall through and capture the stack trace
       // at this throw site.
       stack_trace_object =
           GetDetailedStackTrace(Handle<JSObject>::cast(exception));
     }
     if (stack_trace_object.is_null()) {
       // Not an error object, we capture stack and location at throw site.
       stack_trace_object = CaptureCurrentStackTrace(
@@ skipping 1589 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8