Rename slot.getDistributedNodes() to slot.getAssingedNodes({flatten: true}).

third_party/WebKit/Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/KeyframeEffect.idl',
             'animation/EffectModel.idl',
             'animation/AnimationEffectReadOnly.idl',
@@ skipping 3629 matching lines @@
             'events/RelatedEventInit.idl',
             'events/SecurityPolicyViolationEventInit.idl',
             'events/TouchEventInit.idl',
             'events/TransitionEventInit.idl',
             'events/UIEventInit.idl',
             'events/WheelEventInit.idl',
             'fileapi/BlobPropertyBag.idl',
             'fileapi/FilePropertyBag.idl',
             'frame/ScrollOptions.idl',
             'frame/ScrollToOptions.idl',
+            'html/AssignedNodesOptions.idl',
             'html/MediaKeyEventInit.idl',
             'html/canvas/CanvasContextCreationAttributes.idl',
             'html/track/TrackEventInit.idl',
             'imagebitmap/ImageBitmapOptions.idl',
             'input/InputDeviceCapabilitiesInit.idl',
             'page/EventSourceInit.idl',
             'timing/PerformanceObserverInit.idl',
         ],
         'generated_core_dictionary_files': [
             '<(blink_core_output_dir)/animation/KeyframeEffectOptions.cpp',
@@ skipping 77 matching lines @@
             '<(blink_core_output_dir)/events/WheelEventInit.cpp',
             '<(blink_core_output_dir)/events/WheelEventInit.h',
             '<(blink_core_output_dir)/fileapi/BlobPropertyBag.cpp',
             '<(blink_core_output_dir)/fileapi/BlobPropertyBag.h',
             '<(blink_core_output_dir)/fileapi/FilePropertyBag.cpp',
             '<(blink_core_output_dir)/fileapi/FilePropertyBag.h',
             '<(blink_core_output_dir)/frame/ScrollOptions.cpp',
             '<(blink_core_output_dir)/frame/ScrollOptions.h',
             '<(blink_core_output_dir)/frame/ScrollToOptions.cpp',
             '<(blink_core_output_dir)/frame/ScrollToOptions.h',
+            '<(blink_core_output_dir)/html/AssignedNodesOptions.cpp',
+            '<(blink_core_output_dir)/html/AssignedNodesOptions.h',
             '<(blink_core_output_dir)/html/MediaKeyEventInit.cpp',
             '<(blink_core_output_dir)/html/MediaKeyEventInit.h',
             '<(blink_core_output_dir)/html/canvas/CanvasContextCreationAttributes.cpp',
             '<(blink_core_output_dir)/html/canvas/CanvasContextCreationAttributes.h',
             '<(blink_core_output_dir)/html/track/TrackEventInit.cpp',
             '<(blink_core_output_dir)/html/track/TrackEventInit.h',
             '<(blink_core_output_dir)/imagebitmap/ImageBitmapOptions.cpp',
             '<(blink_core_output_dir)/imagebitmap/ImageBitmapOptions.h',
             '<(blink_core_output_dir)/input/InputDeviceCapabilitiesInit.cpp',
             '<(blink_core_output_dir)/input/InputDeviceCapabilitiesInit.h',
@@ skipping 267 matching lines @@
             'style/SVGComputedStyleTest.cpp',
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }