[Extensions] Make Event::restrict_to_browser_context const.

chrome/browser/chromeos/file_manager/file_browser_handlers.cc

 // Copyright (c) 2012 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/chromeos/file_manager/file_browser_handlers.h"
 
 #include <stddef.h>
 #include <algorithm>
 #include <set>
 #include <utility>
@@ skipping 390 matching lines @@
     file_def->SetString("fileSystemName", iter->file_system_name);
     file_def->SetString("fileSystemRoot", iter->file_system_root_url);
     file_def->SetString("fileFullPath",
                         "/" + iter->full_path.AsUTF8Unsafe());
     file_def->SetBoolean("fileIsDirectory", iter->is_directory);
     file_entries->Append(std::move(file_def));
   }
 
   details->Set("entries", std::move(file_entries));
   event_args->Append(std::move(details));
-  std::unique_ptr<extensions::Event> event(new extensions::Event(
+  auto event = base::MakeUnique<extensions::Event>(
       extensions::events::FILE_BROWSER_HANDLER_ON_EXECUTE,
-      "fileBrowserHandler.onExecute", std::move(event_args)));
-  event->restrict_to_browser_context = profile_;
+      "fileBrowserHandler.onExecute", std::move(event_args), profile_);
   router->DispatchEventToExtension(extension_->id(), std::move(event));
 
   ExecuteDoneOnUIThread(true);
 }
 
 void FileBrowserHandlerExecutor::SetupHandlerHostFileAccessPermissions(
     FileDefinitionList* file_definition_list,
     const Extension* extension,
     int handler_pid) {
   const FileBrowserHandler* action =
@@ skipping 103 matching lines @@
       if (common_handlers.empty())
         return FileBrowserHandlerList();
     }
   }
 
   return common_handlers;
 }
 
 }  // namespace file_browser_handlers
 }  // namespace file_manager