[Curl] Use SynchronousLoaderClient for platformLoadResourceSynchronously on WinCairo

[Curl] Use SynchronousLoaderClient for platformLoadResourceSynchronously on WinCairo
https://bugs.webkit.org/show_bug.cgi?id=173195

Patch by Basuke Suzuki <Basuke.Suzuki@sony.com> on 2017-06-12
Reviewed by Alex Christensen.

* PlatformWinCairo.cmake:
* platform/network/curl/ResourceHandleCurl.cpp:
(WebCore::ResourceHandle::platformLoadResourceSynchronously):
* platform/network/curl/SynchronousLoaderClientCurl.cpp: Added.
(WebCore::SynchronousLoaderClient::didReceiveAuthenticationChallenge):
(WebCore::SynchronousLoaderClient::platformBadResponseError):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@218142 268f45cc-cd09-0410-ab3c-d52691b4dbfc