[Curl] Improve multi-threaded networking

[Curl] Improve multi-threaded networking
https://bugs.webkit.org/show_bug.cgi?id=175253

Patch by Daewoong Jang <daewoong.jang@navercorp.com> on 2017-08-17
Reviewed by Alex Christensen.

* platform/network/curl/CurlContext.cpp:
(WebCore::CurlMultiHandle::CurlMultiHandle):
(WebCore::CurlHandle::CurlHandle):
(WebCore::CurlHandle::initialize):
(WebCore::CurlHandle::setSslKeyPassword):
(WebCore::CurlHandle::setSslErrors):
(WebCore::CurlHandle::getSslErrors):
* platform/network/curl/CurlContext.h:
* platform/network/curl/CurlDownload.cpp:
(WebCore::CurlDownload::init):
(WebCore::CurlDownload::getResponse const):
(WebCore::CurlDownload::setupRequest):
(WebCore::CurlDownload::didReceiveHeader):
(WebCore::CurlDownload::didReceiveData):
(WebCore::CurlDownload::headerCallback):
(WebCore::CurlDownload::getTempPath const): Deleted.
(WebCore::CurlDownload::getUrl const): Deleted.
(WebCore::CurlDownload::downloadFinishedCallback): Deleted.
(WebCore::CurlDownload::downloadFailedCallback): Deleted.
(WebCore::CurlDownload::receivedDataCallback): Deleted.
(WebCore::CurlDownload::receivedResponseCallback): Deleted.
* platform/network/curl/CurlDownload.h:
* platform/network/curl/ResourceError.h:
(WebCore::ResourceError::ResourceError):
(WebCore::ResourceError::sslErrors const):
(WebCore::ResourceError::setSSLErrors): Deleted.
* platform/network/curl/ResourceHandleCurl.cpp:
(WebCore::ResourceHandleInternal::initialize):
(WebCore::ResourceHandleInternal::didFail):
(WebCore::ResourceHandleInternal::dispatchSynchronousJob):
* platform/network/curl/SSLHandle.cpp:
(WebCore::allowedClientHosts):
(WebCore::addAllowedClientCertificate):
(WebCore::getSSLClientCertificate):
(WebCore::certVerifyCallback):
(WebCore::setSSLVerifyOptions):
(WebCore::setSSLClientCertificate): Deleted.
* platform/network/curl/SSLHandle.h:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@220897 268f45cc-cd09-0410-ab3c-d52691b4dbfc