extensions: Use V8 Maybe APIs in NativeHandler

extensions/renderer/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_NATIVE_HANDLER_H_
 #define EXTENSIONS_RENDERER_NATIVE_HANDLER_H_
 
 #include "base/basictypes.h"
 #include "v8/include/v8.h"
 
 namespace extensions {
 
 // NativeHandlers are intended to be used with a ModuleSystem. The ModuleSystem
 // will assume ownership of the NativeHandler, and as a ModuleSystem is tied to
 // a single v8::Context, this implies that NativeHandlers will also be tied to
 // a single v8::Context.
 // TODO(koz): Rename this to NativeJavaScriptModule.
 class NativeHandler {
  public:
   NativeHandler();
   virtual ~NativeHandler();
 
   // Create a new instance of the object this handler specifies.
-  virtual v8::Local<v8::Object> NewInstance() = 0;
+  virtual v8::MaybeLocal<v8::Object> NewInstance() = 0;
 
   // Invalidate this object so it cannot be used any more. This is needed
   // because it's possible for this to outlive its owner context. Invalidate
   // must be called before this happens.
   //
   // Subclasses should override to invalidate their own V8 state. If they do
   // they must call their superclass' Invalidate().
   //
   // Invalidate() will be called on destruction, if it hasn't already been.
   // Subclasses don't need to do it themselves.
   virtual void Invalidate();
 
  protected:
   // Allow subclasses to query valid state.
   bool is_valid() { return is_valid_; }
 
  private:
   bool is_valid_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeHandler);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_NATIVE_HANDLER_H_