In WebInspector resource folders (for Windows) have .svn folders now. Harmless for evaluation, of cource.
Confirmed with WebKit-SVN-r25143.zip.
This is happening because one of the post-build steps in WebCore.vcproj is: xcopy /y /d /s "$(ProjectDir)\..\page\inspector\*" "$(WebKitOutputDir)\bin\WebKit.resources\inspector" This command recursively copies everything beneath WebCore/page/inspector, including the .svn folder. One way to fix this is to use the /exclude: flag. You pass it a file with a newline-separated list of patterns to exclude when copying. Any file matching any of the patterns will not be copied. I believe the pattern needed to exclude the .svn directory is this: \.svn\
I've checked today nightly zip and found no more .svn folders. So the bug is already fixed.