Introduce the Blink NotificationService, move permission checks there

third_party/WebKit/Source/modules/modules.gypi

 {
   'includes': [
     '../core/core_generated.gypi',
     'modules_generated.gypi',
   ],
   'variables': {
     # Experimental hooks for embedder to provide extra IDL and source files.
     #
     # Note: this is not a supported API. If you rely on this, you will be broken
     # from time to time as the code generator changes in backward incompatible
@@ skipping 1322 matching lines @@
       'nfc/NFC.cpp',
       'nfc/NFC.h',
       'notifications/Notification.cpp',
       'notifications/Notification.h',
       'notifications/NotificationData.cpp',
       'notifications/NotificationData.h',
       'notifications/NotificationEvent.cpp',
       'notifications/NotificationEvent.h',
       'notifications/NotificationImageLoader.cpp',
       'notifications/NotificationImageLoader.h',
+      'notifications/NotificationManager.cpp',
+      'notifications/NotificationManager.h',
       'notifications/NotificationPermissionCallback.h',
       'notifications/NotificationPermissionClient.cpp',
       'notifications/NotificationPermissionClient.h',
       'notifications/NotificationResourcesLoader.cpp',
       'notifications/NotificationResourcesLoader.h',
       'notifications/ServiceWorkerGlobalScopeNotifications.h',
       'notifications/ServiceWorkerRegistrationNotifications.cpp',
       'notifications/ServiceWorkerRegistrationNotifications.h',
       'offscreencanvas/OffscreenCanvasModules.cpp',
       'offscreencanvas/OffscreenCanvasModules.h',
@@ skipping 669 matching lines @@
       'webaudio/ConvolverNodeTest.cpp',
       'webaudio/DynamicsCompressorNodeTest.cpp',
       'webaudio/ScriptProcessorNodeTest.cpp',
       'webaudio/StereoPannerNodeTest.cpp',
       'webdatabase/QuotaTrackerTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }