Remove NOTIFICATION_EXTENSION_ENABLED.

chrome/browser/extensions/extension_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 
 #include <map>
 #include <memory>
 #include <set>
@@ skipping 569 matching lines @@
   // Called on file task runner thread to uninstall extension.
   static void UninstallExtensionOnFileThread(
       const std::string& id,
       Profile* profile,
       const base::FilePath& install_dir,
       const base::FilePath& extension_path);
 
   // Called when the initial extensions load has completed.
   void OnInstalledExtensionsLoaded();
 
+  // Upon reloading an extension, spins up its lazy background page if
+  // necessary.
+  void MaybeSpinUpLazyBackgroundPage(const extensions::Extension* extension_id);
+
   const base::CommandLine* command_line_ = nullptr;
 
   // The normal profile associated with this ExtensionService.
   Profile* profile_ = nullptr;
 
   // The ExtensionSystem for the profile above.
   extensions::ExtensionSystem* system_ = nullptr;
 
   // Preferences for the owning profile.
   extensions::ExtensionPrefs* extension_prefs_ = nullptr;
@@ skipping 145 matching lines @@
                            GreylistUnknownDontChange);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            ManagementPolicyProhibitsEnableOnInstalled);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            BlockAndUnblockBlacklistedExtension);
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionService);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_