Use V8 Maybe APIs in extensions/renderer

extensions/renderer/api_activity_logger.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 <string>
 
 #include "base/bind.h"
 #include "content/public/child/v8_value_converter.h"
 #include "content/public/renderer/render_thread.h"
 #include "extensions/common/extension_messages.h"
@@ skipping 41 matching lines @@
     params.extra = "";
 
   // Get the array of api call arguments.
   v8::Local<v8::Array> arg_array = v8::Local<v8::Array>::Cast(args[2]);
   if (arg_array->Length() > 0) {
     scoped_ptr<V8ValueConverter> converter(V8ValueConverter::create());
     ActivityLogConverterStrategy strategy;
     converter->SetFunctionAllowed(true);
     converter->SetStrategy(&strategy);
     scoped_ptr<base::ListValue> arg_list(new base::ListValue());
-    for (size_t i = 0; i < arg_array->Length(); ++i) {
-      arg_list->Set(
-          i,
-          converter->FromV8Value(arg_array->Get(i),
-                                 args.GetIsolate()->GetCurrentContext()));
+    v8::Local<v8::Context> context = args.GetIsolate()->GetCurrentContext();
+    for (uint32_t i = 0; i < arg_array->Length(); ++i) {
+      v8::Local<v8::Value> property;
+      if (!arg_array->Get(context, i).ToLocal(&property))
+        return;
+      arg_list->Set(i, converter->FromV8Value(property, context));
     }
     params.arguments.Swap(arg_list.get());
   }
 
   if (call_type == APICALL) {
     content::RenderThread::Get()->Send(
         new ExtensionHostMsg_AddAPIActionToActivityLog(ext_id, params));
   } else if (call_type == EVENT) {
     content::RenderThread::Get()->Send(
         new ExtensionHostMsg_AddEventToActivityLog(ext_id, params));
   }
 }
 
 }  // namespace extensions