[extension SW]: Support event listener registration and event dispatching.

extensions/browser/extension_prefs.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 "extensions/browser/extension_prefs.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <iterator>
@@ skipping 1925 matching lines @@
   if (!extension_dict->HasKey(pref_names::kPrefIncognitoContentSettings)) {
     extension_dict->Set(pref_names::kPrefIncognitoContentSettings,
                         new base::ListValue);
   }
 
   // If this point has been reached, any pending installs should be considered
   // out of date.
   extension_dict->Remove(kDelayedInstallInfo, NULL);
 
   // Clear state that may be registered from a previous install.
-  extension_dict->Remove(EventRouter::kRegisteredEvents, NULL);
+  extension_dict->Remove(EventRouter::kRegisteredLazyEvents, nullptr);
+  extension_dict->Remove(EventRouter::kRegisteredServiceWorkerEvents, nullptr);
 
   // FYI, all code below here races on sudden shutdown because |extension_dict|,
   // |app_sorting|, |extension_pref_value_map_|, and (potentially) observers
   // are updated non-transactionally. This is probably not fixable without
   // nested transactional updates to pref dictionaries.
   if (needs_sort_ordinal)
     app_sorting()->EnsureValidOrdinals(extension_id, suggested_page_ordinal);
 
   bool is_enabled = false;
   int initial_state;
   if (extension_dict->GetInteger(kPrefState, &initial_state)) {
     is_enabled = initial_state == Extension::ENABLED;
   }
   bool is_incognito_enabled = IsIncognitoEnabled(extension_id);
 
   extension_pref_value_map_->RegisterExtension(
       extension_id, install_time, is_enabled, is_incognito_enabled);
 
   for (auto& observer : observer_list_)
     observer.OnExtensionRegistered(extension_id, install_time, is_enabled);
 }
 
 }  // namespace extensions