Make WebThreadedDataReceiver wrap a Blink-managed object instead.

Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/Animation.idl',
             'animation/AnimationEffect.idl',
             'animation/AnimationNode.idl',
@@ skipping 2929 matching lines @@
             'html/parser/HTMLTreeBuilderSimulator.cpp',
             'html/parser/HTMLTreeBuilderSimulator.h',
             'html/parser/HTMLViewSourceParser.cpp',
             'html/parser/HTMLViewSourceParser.h',
             'html/parser/InputStreamPreprocessor.h',
             'html/parser/NestingLevelIncrementer.h',
             'html/parser/TextDocumentParser.cpp',
             'html/parser/TextDocumentParser.h',
             'html/parser/TextResourceDecoder.cpp',
             'html/parser/TextResourceDecoder.h',
+            'html/parser/ThreadedDataReceiver.h',
             'html/parser/XSSAuditor.cpp',
             'html/parser/XSSAuditor.h',
             'html/parser/XSSAuditorDelegate.cpp',
             'html/parser/XSSAuditorDelegate.h',
             'html/shadow/ClearButtonElement.cpp',
             'html/shadow/ClearButtonElement.h',
             'html/shadow/DateTimeEditElement.cpp',
             'html/shadow/DateTimeEditElement.h',
             'html/shadow/DateTimeFieldElement.cpp',
             'html/shadow/DateTimeFieldElement.h',
@@ skipping 796 matching lines @@
             'rendering/style/RenderStyleTest.cpp',
             'rendering/style/SVGRenderStyleTest.cpp',
             'streams/ReadableStreamTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }