Make isolate.h usable without objects-inl.h header.

src/runtime/runtime-observe.cc

 // Copyright 2014 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/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/debug/debug.h"
+#include "src/isolate-inl.h"
 
 namespace v8 {
 namespace internal {
 
 RUNTIME_FUNCTION(Runtime_IsObserved) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
 
   if (!args[0]->IsJSReceiver()) return isolate->heap()->false_value();
   CONVERT_ARG_CHECKED(JSReceiver, obj, 0);
@@ skipping 132 matching lines @@
 RUNTIME_FUNCTION(Runtime_GetObjectContextNotifierPerformChange) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, object_info, 0);
 
   Handle<Context> context(object_info->GetCreationContext(), isolate);
   return context->native_object_notifier_perform_change();
 }
 }  // namespace internal
 }  // namespace v8