Remove [NoHeader] interface extended attribute

Source/modules/modules.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
     # ways.
     'extra_blink_module_idl_files': [],
     'extra_blink_module_files': [],
     # Files for which bindings (.cpp and .h files) will be generated
@@ skipping 445 matching lines @@
       'mediasource/URLMediaSource.cpp',
       'mediasource/URLMediaSource.h',
       'mediasource/VideoPlaybackQuality.cpp',
       'mediasource/VideoPlaybackQuality.h',
       'mediasource/WebKitMediaSource.cpp',
       'mediasource/WebKitMediaSource.h',
       'mediasource/WebKitSourceBuffer.cpp',
       'mediasource/WebKitSourceBuffer.h',
       'mediasource/WebKitSourceBufferList.cpp',
       'mediasource/WebKitSourceBufferList.h',
+      'mediasource/WindowMediaSource.h',
       'mediastream/MediaConstraintsImpl.cpp',
       'mediastream/MediaConstraintsImpl.h',
       'mediastream/MediaDeviceInfo.cpp',
       'mediastream/MediaDeviceInfo.h',
       'mediastream/MediaDeviceInfoCallback.h',
       'mediastream/MediaDevicesRequest.cpp',
       'mediastream/MediaDevicesRequest.h',
       'mediastream/MediaStream.cpp',
       'mediastream/MediaStream.h',
       'mediastream/MediaStreamEvent.cpp',
@@ skipping 404 matching lines @@
       'indexeddb/IDBKeyPathTest.cpp',
       'indexeddb/IDBRequestTest.cpp',
       'indexeddb/IDBTransactionTest.cpp',
       'websockets/WebSocketDeflaterTest.cpp',
       'websockets/WebSocketExtensionDispatcherTest.cpp',
       'websockets/WebSocketExtensionParserTest.cpp',
       'websockets/WebSocketPerMessageDeflateTest.cpp',
     ],
   },
 }