[Extensions] Make Event::restrict_to_browser_context const.

chrome/browser/extensions/api/feedback_private/feedback_private_api.cc

 // Copyright 2013 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 "chrome/browser/extensions/api/feedback_private/feedback_private_api.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 129 matching lines @@
     const bool use_system_window_frame = true;
 #else
     const bool use_system_window_frame = false;
 #endif
     info.use_system_window_frame =
         base::MakeUnique<bool>(use_system_window_frame);
 
     std::unique_ptr<base::ListValue> args =
         feedback_private::OnFeedbackRequested::Create(info);
 
-    std::unique_ptr<Event> event(new Event(
+    auto event = base::MakeUnique<Event>(
         events::FEEDBACK_PRIVATE_ON_FEEDBACK_REQUESTED,
-        feedback_private::OnFeedbackRequested::kEventName, std::move(args)));
-    event->restrict_to_browser_context = browser_context_;
+        feedback_private::OnFeedbackRequested::kEventName, std::move(args),
+        browser_context_);
 
     EventRouter::Get(browser_context_)
         ->DispatchEventToExtension(extension_misc::kFeedbackExtensionId,
                                    std::move(event));
   }
 }
 
 // static
 base::Closure* FeedbackPrivateGetStringsFunction::test_callback_ = NULL;
 
@@ skipping 194 matching lines @@
     case feedback_private::SRT_PROMPT_RESULT_CLOSED:
       base::RecordAction(base::UserMetricsAction("Feedback.SrtPromptClosed"));
       break;
     default:
       return RespondNow(Error("Invalid arugment."));
   }
   return RespondNow(NoArguments());
 }
 
 }  // namespace extensions