[Extensions] Make Event::restrict_to_browser_context const.

chrome/browser/extensions/permissions_updater.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/extensions/permissions_updater.h"
 
 #include <utility>
 
 #include "base/memory/ref_counted.h"
 #include "base/values.h"
@@ skipping 260 matching lines @@
     const char* event_name,
     const PermissionSet& changed_permissions) {
   EventRouter* event_router = EventRouter::Get(browser_context_);
   if (!event_router)
     return;
 
   std::unique_ptr<base::ListValue> value(new base::ListValue());
   std::unique_ptr<api::permissions::Permissions> permissions =
       PackPermissionSet(changed_permissions);
   value->Append(permissions->ToValue());
-  std::unique_ptr<Event> event(
-      new Event(histogram_value, event_name, std::move(value)));
-  event->restrict_to_browser_context = browser_context_;
+  auto event = base::MakeUnique<Event>(histogram_value, event_name,
+                                       std::move(value), browser_context_);
   event_router->DispatchEventToExtension(extension_id, std::move(event));
 }
 
 void PermissionsUpdater::NotifyPermissionsUpdated(
     EventType event_type,
     const Extension* extension,
     const PermissionSet& changed) {
   DCHECK_EQ(0, init_flag_ & INIT_FLAG_TRANSIENT);
 
   if (changed.IsEmpty() && event_type != POLICY)
@@ skipping 75 matching lines @@
        !host_iterator.IsAtEnd(); host_iterator.Advance()) {
     RenderProcessHost* host = host_iterator.GetCurrentValue();
     if (profile->IsSameProfile(
             Profile::FromBrowserContext(host->GetBrowserContext()))) {
       host->Send(new ExtensionMsg_UpdateDefaultPolicyHostRestrictions(params));
     }
   }
 }
 
 }  // namespace extensions