Re-land: bindings: Use MessageEventInit for MessageEvent constructor

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 3561 matching lines @@
             'events/AnimationPlayerEventInit.idl',
             'events/ApplicationCacheErrorEventInit.idl',
             'events/AutocompleteErrorEventInit.idl',
             'events/CompositionEventInit.idl',
             'events/CustomEventInit.idl',
             'events/ErrorEventInit.idl',
             'events/EventInit.idl',
             'events/FocusEventInit.idl',
             'events/HashChangeEventInit.idl',
             'events/KeyboardEventInit.idl',
+            'events/MessageEventInit.idl',
             'events/MouseEventInit.idl',
             'events/OverflowEventInit.idl',
             'events/PageTransitionEventInit.idl',
             'events/PointerEventInit.idl',
             'events/PopStateEventInit.idl',
             'events/ProgressEventInit.idl',
             'events/RelatedEventInit.idl',
             'events/SecurityPolicyViolationEventInit.idl',
             'events/SharedKeyboardAndMouseEventInit.idl',
             'events/TransitionEventInit.idl',
@@ skipping 43 matching lines @@
             '<(blink_core_output_dir)/events/ErrorEventInit.cpp',
             '<(blink_core_output_dir)/events/ErrorEventInit.h',
             '<(blink_core_output_dir)/events/EventInitDictionary.cpp',
             '<(blink_core_output_dir)/events/EventInitDictionary.h',
             '<(blink_core_output_dir)/events/FocusEventInit.cpp',
             '<(blink_core_output_dir)/events/FocusEventInit.h',
             '<(blink_core_output_dir)/events/HashChangeEventInit.cpp',
             '<(blink_core_output_dir)/events/HashChangeEventInit.h',
             '<(blink_core_output_dir)/events/KeyboardEventInit.cpp',
             '<(blink_core_output_dir)/events/KeyboardEventInit.h',
+            '<(blink_core_output_dir)/events/MessageEventInit.cpp',
+            '<(blink_core_output_dir)/events/MessageEventInit.h',
             '<(blink_core_output_dir)/events/MouseEventInit.cpp',
             '<(blink_core_output_dir)/events/MouseEventInit.h',
             '<(blink_core_output_dir)/events/OverflowEventInit.cpp',
             '<(blink_core_output_dir)/events/OverflowEventInit.h',
             '<(blink_core_output_dir)/events/PageTransitionEventInit.cpp',
             '<(blink_core_output_dir)/events/PageTransitionEventInit.h',
             '<(blink_core_output_dir)/events/PointerEventInit.cpp',
             '<(blink_core_output_dir)/events/PointerEventInit.h',
             '<(blink_core_output_dir)/events/PopStateEventInit.cpp',
             '<(blink_core_output_dir)/events/PopStateEventInit.h',
@@ skipping 256 matching lines @@
             'style/ComputedStyleTest.cpp',
             'style/OutlineValueTest.cpp',
             'style/SVGComputedStyleTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }