Remove core/platform/win

Source/platform/blink_platform.gypi

 {
   'variables': {
     'platform_files': [
       'Clock.cpp',
       'Clock.h',
       'ContentType.cpp',
       'ContentType.h',
       'DateComponents.cpp',
       'DateComponents.h',
       'Decimal.cpp',
@@ skipping 240 matching lines @@
       'text/TextEncodingDetector.h',
       'text/TextStream.cpp',
       'text/TextStream.h',
       'text/UnicodeBidi.h',
       'text/UnicodeRange.cpp',
       'text/UnicodeRange.h',
       'transforms/AffineTransform.cpp',
       'transforms/AffineTransform.h',
       'transforms/TransformationMatrix.cpp',
       'transforms/TransformationMatrix.h',
+      'win/HWndDC.h',
+      'win/SystemInfo.cpp',
+      'win/SystemInfo.h',
     ],
     'platform_test_files': [
       'ClockTest.cpp',
       'DecimalTest.cpp',
       'LayoutUnitTest.cpp',
       'PODArenaTest.cpp',
       'PODFreeListArenaTest.cpp',
       'PODIntervalTreeTest.cpp',
       'PODRedBlackTreeTest.cpp',
       'SharedBufferTest.cpp',
       'animation/UnitBezierTest.cpp',
       'clipboard/ClipboardUtilitiesTest.cpp',
       'clipboard/ClipboardUtilitiesTest.cpp',
       'geometry/RoundedRectTest.cpp',
       'geometry/RoundedRectTest.cpp',
       'testing/ArenaTestHelpers.h',
       'testing/TreeTestHelpers.cpp',
       'testing/TreeTestHelpers.h',
       'text/DateTimeFormatTest.cpp',
       'text/DateTimeFormatTest.cpp',
     ],
   },
 }