Filing a bug so I can test my change against the Windows EWS bot.
c:\cygwin\home\buildbot\worker\win10-debug\build\source\webcore\page\frame.cpp(689): error C2220: warning treated as error - no 'object' file generated [C:\cygwin\home\buildbot\worker\win10-debug\build\WebKitBuild\Debug\Source\WebCore\WebCore.vcxproj] c:\cygwin\home\buildbot\worker\win10-debug\build\source\webcore\page\frame.cpp(689): warning C4715: 'WebCore::Frame::requestDOMPasteAccess': not all control paths return a value [C:\cygwin\home\buildbot\worker\win10-debug\build\WebKitBuild\Debug\Source\WebCore\WebCore.vcxproj]
Created attachment 361861 [details] Patch
Created attachment 361862 [details] Patch
It looks like Alex just landed a fix for this in r241331.