Use V8 Maybe APIs in extensions/renderer

extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.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/guest_view/mime_handler_view/mime_handler_view_container.h"
 
 #include <map>
 #include <set>
 
 #include "components/guest_view/common/guest_view_constants.h"
@@ skipping 25 matching lines @@
 class ScriptableObject : public gin::Wrappable<ScriptableObject>,
                          public gin::NamedPropertyInterceptor {
  public:
   static gin::WrapperInfo kWrapperInfo;
 
   static v8::Local<v8::Object> Create(
       v8::Isolate* isolate,
       base::WeakPtr<MimeHandlerViewContainer> container) {
     ScriptableObject* scriptable_object =
         new ScriptableObject(isolate, container);
-    return gin::CreateHandle(isolate, scriptable_object).ToV8()->ToObject();
+    return gin::CreateHandle(isolate, scriptable_object)
+        .ToV8()
+        .As<v8::Object>();
   }
 
   // gin::NamedPropertyInterceptor
   v8::Local<v8::Value> GetNamedProperty(
       v8::Isolate* isolate,
       const std::string& identifier) override {
     if (identifier == kPostMessageName) {
       if (post_message_function_template_.IsEmpty()) {
         post_message_function_template_.Reset(
             isolate,
             gin::CreateFunctionTemplate(
                 isolate, base::Bind(&MimeHandlerViewContainer::PostMessage,
                                     container_, isolate)));
       }
-      return v8::Local<v8::FunctionTemplate>::New(
-                 isolate, post_message_function_template_)->GetFunction();
+      v8::Local<v8::FunctionTemplate> function_template =
+          v8::Local<v8::FunctionTemplate>::New(isolate,
+                                               post_message_function_template_);
+      v8::Local<v8::Function> interceptor;
+      if (function_template->GetFunction(isolate->GetCurrentContext())
+              .ToLocal(&interceptor))
+        return interceptor;
     }
     return v8::Local<v8::Value>();
   }
 
  private:
   ScriptableObject(v8::Isolate* isolate,
                    base::WeakPtr<MimeHandlerViewContainer> container)
     : gin::NamedPropertyInterceptor(isolate, this),
       container_(container) {}
 
@@ skipping 239 matching lines @@
   if (!render_frame())
     return;
 
   render_frame()->Send(
       new ExtensionsGuestViewHostMsg_CreateMimeHandlerViewGuest(
           render_frame()->GetRoutingID(), view_id_, element_instance_id(),
           element_size_));
 }
 
 }  // namespace extensions