Fix the hasBackingFile flag for File backed by a file system URL.

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 3562 matching lines @@
             'editing/FrameSelectionTest.cpp',
             'editing/InputMethodControllerTest.cpp',
             'editing/SurroundingTextTest.cpp',
             'editing/TextIteratorTest.cpp',
             'editing/VisibleSelectionTest.cpp',
             'fetch/CachingCorrectnessTest.cpp',
             'fetch/ImageResourceTest.cpp',
             'fetch/MemoryCacheTest.cpp',
             'fetch/RawResourceTest.cpp',
             'fetch/ResourceFetcherTest.cpp',
+            'fileapi/FileTest.cpp',
             'frame/ImageBitmapTest.cpp',
             'frame/SubresourceIntegrityTest.cpp',
             'html/HTMLDimensionTest.cpp',
             'html/HTMLFormControlElementTest.cpp',
             'html/HTMLLinkElementSizesAttributeTest.cpp',
             'html/HTMLSelectElementTest.cpp',
             'html/HTMLTextFormControlElementTest.cpp',
             'html/LinkRelAttributeTest.cpp',
             'html/TimeRangesTest.cpp',
             'html/parser/HTMLParserThreadTest.cpp',
@@ skipping 13 matching lines @@
             'rendering/shapes/BoxShapeTest.cpp',
             'rendering/style/OutlineValueTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'streams/ReadableStreamTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }