Use V8 Maybe APIs in extensions/renderer

extensions/renderer/resource_bundle_source_map.cc

 // Copyright 2014 The Chromium 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 "extensions/renderer/resource_bundle_source_map.h"
 
 #include "base/logging.h"
 #include "ui/base/resource/resource_bundle.h"
 
 namespace extensions {
@@ skipping 30 matching lines @@
 
 bool ResourceBundleSourceMap::Contains(const std::string& name) {
   return !!resource_id_map_.count(name);
 }
 
 v8::Local<v8::String> ResourceBundleSourceMap::ConvertString(
     v8::Isolate* isolate,
     const base::StringPiece& string) {
   // v8 takes ownership of the StaticV8ExternalOneByteStringResource (see
   // v8::String::NewExternal()).
-  return v8::String::NewExternal(
-      isolate, new StaticV8ExternalOneByteStringResource(string));
+  return v8::String::NewExternalOneByte(
+             isolate, new StaticV8ExternalOneByteStringResource(string))
+      .ToLocalChecked();
 }
 
 }  // namespace extensions