extensions: Use V8 Maybe APIs in NativeHandler

extensions/renderer/object_backed_native_handler.h

 // 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.
 
 #ifndef EXTENSIONS_RENDERER_OBJECT_BACKED_NATIVE_HANDLER_H_
 #define EXTENSIONS_RENDERER_OBJECT_BACKED_NATIVE_HANDLER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/memory/linked_ptr.h"
 #include "extensions/renderer/native_handler.h"
 #include "v8/include/v8-util.h"
 #include "v8/include/v8.h"
 
 namespace extensions {
 class ScriptContext;
 
 // An ObjectBackedNativeHandler is a factory for JS objects with functions on
 // them that map to native C++ functions. Subclasses should call RouteFunction()
 // in their constructor to define functions on the created JS objects.
 class ObjectBackedNativeHandler : public NativeHandler {
  public:
   explicit ObjectBackedNativeHandler(ScriptContext* context);
   ~ObjectBackedNativeHandler() override;
 
   // Create an object with bindings to the native functions defined through
   // RouteFunction().
-  v8::Local<v8::Object> NewInstance() override;
+  v8::MaybeLocal<v8::Object> NewInstance() override;
 
   v8::Isolate* GetIsolate() const;
 
  protected:
   typedef base::Callback<void(const v8::FunctionCallbackInfo<v8::Value>&)>
       HandlerFunction;
 
   // Installs a new 'route' from |name| to |handler_function|. This means that
   // NewInstance()s of this ObjectBackedNativeHandler will have a property
   // |name| which will be handled by |handler_function|.
@@ skipping 32 matching lines @@
   ScriptContext* context_;
 
   v8::Global<v8::ObjectTemplate> object_template_;
 
   DISALLOW_COPY_AND_ASSIGN(ObjectBackedNativeHandler);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_OBJECT_BACKED_NATIVE_HANDLER_H_