[HTMLCanvasElement.toBlob] Default callback version without scheduler

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 54 matching lines @@
       'filesystem/DOMFileSystemSync.idl',
       'filesystem/DirectoryEntry.idl',
       'filesystem/DirectoryEntrySync.idl',
       'filesystem/DirectoryReader.idl',
       'filesystem/DirectoryReaderSync.idl',
       'filesystem/EntriesCallback.idl',
       'filesystem/Entry.idl',
       'filesystem/EntryCallback.idl',
       'filesystem/EntrySync.idl',
       'filesystem/ErrorCallback.idl',
-      'filesystem/FileCallback.idl',
       'filesystem/FileEntry.idl',
       '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',
@@ skipping 852 matching lines @@
       'filesystem/DraggedIsolatedFileSystemImpl.h',
       'filesystem/EntriesCallback.h',
       'filesystem/Entry.cpp',
       'filesystem/Entry.h',
       'filesystem/EntryBase.cpp',
       'filesystem/EntryBase.h',
       'filesystem/EntryCallback.h',
       'filesystem/EntrySync.cpp',
       'filesystem/EntrySync.h',
       'filesystem/ErrorCallback.h',
-      'filesystem/FileCallback.h',
       'filesystem/FileEntry.cpp',
       'filesystem/FileEntry.h',
       'filesystem/FileEntrySync.cpp',
       'filesystem/FileEntrySync.h',
       'filesystem/FileSystemCallback.h',
       'filesystem/FileSystemCallbacks.cpp',
       'filesystem/FileSystemCallbacks.h',
       'filesystem/FileSystemClient.h',
       'filesystem/FileWriter.cpp',
       'filesystem/FileWriter.h',
@@ skipping 808 matching lines @@
       'webaudio/AudioBasicProcessorHandlerTest.cpp',
       'webaudio/ConvolverNodeTest.cpp',
       'webaudio/DynamicsCompressorNodeTest.cpp',
       'webaudio/ScriptProcessorNodeTest.cpp',
       'webaudio/StereoPannerNodeTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }