[Extensions] Make Event::restrict_to_browser_context const.

chrome/browser/extensions/api/activity_log_private/activity_log_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/activity_log_private/activity_log_private_api.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 75 matching lines @@
 }
 
 void ActivityLogAPI::OnListenerRemoved(const EventListenerInfo& details) {
   // TODO(felt): Only observe activity_log_ events when we have a customer.
 }
 
 void ActivityLogAPI::OnExtensionActivity(scoped_refptr<Action> activity) {
   std::unique_ptr<base::ListValue> value(new base::ListValue());
   ExtensionActivity activity_arg = activity->ConvertToExtensionActivity();
   value->Append(activity_arg.ToValue());
-  std::unique_ptr<Event> event(new Event(
+  auto event = base::MakeUnique<Event>(
       events::ACTIVITY_LOG_PRIVATE_ON_EXTENSION_ACTIVITY,
-      activity_log_private::OnExtensionActivity::kEventName, std::move(value)));
-  event->restrict_to_browser_context = browser_context_;
+      activity_log_private::OnExtensionActivity::kEventName, std::move(value),
+      browser_context_);
   EventRouter::Get(browser_context_)->BroadcastEvent(std::move(event));
 }
 
 bool ActivityLogPrivateGetExtensionActivitiesFunction::RunAsync() {
   std::unique_ptr<activity_log_private::GetExtensionActivities::Params> params(
       activity_log_private::GetExtensionActivities::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params.get());
 
   // Get the arguments in the right format.
   Filter filter = std::move(params->filter);
@@ skipping 102 matching lines @@
   for (const std::string& url : urls)
     gurls.push_back(GURL(url));
 
   ActivityLog* activity_log = ActivityLog::GetInstance(browser_context());
   DCHECK(activity_log);
   activity_log->RemoveURLs(gurls);
   return RespondNow(NoArguments());
 }
 
 }  // namespace extensions