Use BlobCallback in toBlob instead of FileCallback

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 124 matching lines @@
             'events/PromiseRejectionEvent.idl',
             'events/RelatedEvent.idl',
             'events/ResourceProgressEvent.idl',
             'events/SecurityPolicyViolationEvent.idl',
             'events/TextEvent.idl',
             'events/TouchEvent.idl',
             'events/TransitionEvent.idl',
             'events/UIEvent.idl',
             'events/WheelEvent.idl',
             'fileapi/Blob.idl',
+            'fileapi/BlobCallback.idl',
             'fileapi/File.idl',
             'fileapi/FileCallback.idl',
             'fileapi/FileError.idl',
             'fileapi/FileList.idl',
             'fileapi/FileReader.idl',
             'fileapi/FileReaderSync.idl',
             'frame/BarProp.idl',
             'frame/Console.idl',
             'frame/ConsoleBase.idl',
             'frame/History.idl',
@@ skipping 3874 matching lines @@
             'style/SVGComputedStyleTest.cpp',
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }