[TestWebKitAPI][Win] Remove WEBCORE_EXPORT and WEBCORE_TESTSUPPORT_EXPORT definitions in PlatformWin.cmake Those macros should be defined only by Source/WebCore/platform/PlatformExportMacros.h.
Created attachment 404032 [details] Patch
Committed r264253: <https://trac.webkit.org/changeset/264253>
<rdar://problem/65378433>