Fix userVisibility() for files dragged into the renderer.

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/AnimationPlayer.idl',
@@ skipping 3365 matching lines @@
             'animation/CompositorAnimationsTestHelper.h',
             'animation/CompositorAnimationsTimingFunctionReverserTest.cpp',
             'animation/EffectInputTest.cpp',
             'animation/InterpolableValueTest.cpp',
             'animation/InterpolationEffectTest.cpp',
             'animation/KeyframeEffectModelTest.cpp',
             'animation/TimingCalculationsTest.cpp',
             'animation/TimingInputTest.cpp',
             'animation/DeferredLegacyStyleInterpolationTest.cpp',
             'animation/LengthStyleInterpolationTest.cpp',
+            'clipboard/DataObjectTest.cpp',
             'css/AffectedByFocusTest.cpp',
             'css/CSSCalculationValueTest.cpp',
             'css/CSSFontFaceTest.cpp',
             'css/CSSParserValuesTest.cpp',
             'css/CSSSelectorTest.cpp',
             'css/CSSTestHelper.cpp',
             'css/CSSTestHelper.h',
             'css/CSSValueTestHelper.h',
             'css/DragUpdateTest.cpp',
             'css/MediaValuesTest.cpp',
@@ skipping 44 matching lines @@
             'rendering/RenderTableRowTest.cpp',
             'rendering/shapes/BoxShapeTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'streams/ReadableStreamTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }