Sync Navigator.getGamepads() with the spec

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 47 matching lines @@
       'filesystem/FileEntrySync.idl',
       'filesystem/FileSystemCallback.idl',
       'filesystem/FileWriter.idl',
       'filesystem/FileWriterCallback.idl',
       'filesystem/FileWriterSync.idl',
       'filesystem/Metadata.idl',
       'filesystem/MetadataCallback.idl',
       'gamepad/Gamepad.idl',
       'gamepad/GamepadButton.idl',
       'gamepad/GamepadEvent.idl',
-      'gamepad/GamepadList.idl',
       'geofencing/CircularGeofencingRegion.idl',
       'geofencing/Geofencing.idl',
       'geofencing/GeofencingEvent.idl',
       'geofencing/GeofencingRegion.idl',
       'geolocation/Coordinates.idl',
       'geolocation/Geolocation.idl',
       'geolocation/Geoposition.idl',
       'geolocation/PositionCallback.idl',
       'geolocation/PositionError.idl',
       'geolocation/PositionErrorCallback.idl',
@@ skipping 1155 matching lines @@
       'indexeddb/IDBKeyPathTest.cpp',
       'indexeddb/IDBRequestTest.cpp',
       'indexeddb/IDBTransactionTest.cpp',
       'serviceworkers/CacheTest.cpp',
       'serviceworkers/ServiceWorkerContainerTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }