Replace SVGDocument by XMLDocument

Source/core/core.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',
             'animation/TimedItem.idl',
             'animation/Timeline.idl',
             'animation/Timing.idl',
@@ skipping 2959 matching lines @@
             'svg/SVGComponentTransferFunctionElement.cpp',
             'svg/SVGComponentTransferFunctionElement.h',
             'svg/SVGCursorElement.cpp',
             'svg/SVGCursorElement.h',
             'svg/SVGDefsElement.cpp',
             'svg/SVGDefsElement.h',
             'svg/SVGDescElement.cpp',
             'svg/SVGDescElement.h',
             'svg/SVGDiscardElement.cpp',
             'svg/SVGDiscardElement.h',
-            'svg/SVGDocument.cpp',
-            'svg/SVGDocument.h',
             'svg/SVGDocumentExtensions.cpp',
             'svg/SVGElement.cpp',
             'svg/SVGElementInstance.cpp',
             'svg/SVGElementInstance.h',
             'svg/SVGElementRareData.h',
             'svg/SVGEllipseElement.cpp',
             'svg/SVGEllipseElement.h',
             'svg/SVGEnumeration.cpp',
             'svg/SVGFEBlendElement.cpp',
             'svg/SVGFEBlendElement.h',
@@ skipping 403 matching lines @@
             'html/track/vtt/VTTScannerTest.cpp',
             'loader/MixedContentCheckerTest.cpp',
             'rendering/RenderOverflowTest.cpp',
             'rendering/shapes/BoxShapeTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }