Don't expose nonstandard FileSystem API to Service Workers

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 326 matching lines @@
       'crypto/WorkerGlobalScopeCrypto.idl',
       'device_light/WindowDeviceLight.idl',
       'device_orientation/WindowDeviceMotion.idl',
       'device_orientation/WindowDeviceOrientation.idl',
       'donottrack/NavigatorDoNotTrack.idl',
       'encryptedmedia/HTMLMediaElementEncryptedMedia.idl',
       'encryptedmedia/NavigatorRequestMediaKeySystemAccess.idl',
       'fetch/WindowFetch.idl',
       'fetch/WorkerFetch.idl',
       'filesystem/DataTransferItemFileSystem.idl',
+      'filesystem/DedicatedWorkerGlobalScopeFileSystem.idl',
       'filesystem/DevToolsHostFileSystem.idl',
       'filesystem/HTMLInputElementFileSystem.idl',
+      'filesystem/SharedWorkerGlobalScopeFileSystem.idl',
       'filesystem/WindowFileSystem.idl',
-      'filesystem/WorkerGlobalScopeFileSystem.idl',
       'gamepad/NavigatorGamepad.idl',
       'geofencing/ServiceWorkerGlobalScopeGeofencing.idl',
       'geofencing/ServiceWorkerRegistrationGeofencing.idl',
       'geofencing/WorkerNavigatorGeofencing.idl',
       'geolocation/NavigatorGeolocation.idl',
       'indexeddb/WindowIndexedDatabase.idl',
       'indexeddb/WorkerGlobalScopeIndexedDatabase.idl',
       'mediacapturefromelement/HTMLCanvasElementCapture.idl',
       'mediacapturefromelement/HTMLMediaElementCapture.idl',
       'mediasession/HTMLMediaElementMediaSession.idl',
@@ skipping 1565 matching lines @@
       'webaudio/AudioBasicProcessorHandlerTest.cpp',
       'webaudio/ConvolverNodeTest.cpp',
       'webaudio/DynamicsCompressorNodeTest.cpp',
       'webaudio/ScriptProcessorNodeTest.cpp',
       'webaudio/StereoPannerNodeTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }