Move Download authentication code to AuthenticationManager

Move Download authentication code to AuthenticationManager
https://bugs.webkit.org/show_bug.cgi?id=154132

Reviewed by Sam Weinig.

When a video element makes a request that receives an authentication challenge, the
AuthenticationManager receives an AuthenticationChallenge without an AuthenticationClient.
As a result, Download::receivedCredential and other functions were being called, which
sent a message to the challenge's sender.  This functionality is not specific to downloads,
so I moved it from Download to AuthenticationManager.

This fixes http/tests/media/video-auth.html when using NetworkSession
because I use AuthenticationManager::receivedCredential if there is no AuthenticationClient
instead of improperly asserting that there is always an AuthenticationClient if there is no
completionHandler.

* NetworkProcess/Downloads/Download.h:
* NetworkProcess/Downloads/ios/DownloadIOS.mm:
(WebKit::Download::platformDidFinish):
(WebKit::Download::receivedCredential): Deleted.
(WebKit::Download::receivedRequestToContinueWithoutCredential): Deleted.
(WebKit::Download::receivedCancellation): Deleted.
(WebKit::Download::receivedRequestToPerformDefaultHandling): Deleted.
(WebKit::Download::receivedChallengeRejection): Deleted.
* NetworkProcess/Downloads/mac/DownloadMac.mm:
(WebKit::Download::platformDidFinish):
(WebKit::Download::receivedCredential): Deleted.
(WebKit::Download::receivedRequestToContinueWithoutCredential): Deleted.
(WebKit::Download::receivedCancellation): Deleted.
(WebKit::Download::receivedRequestToPerformDefaultHandling): Deleted.
(WebKit::Download::receivedChallengeRejection): Deleted.
* NetworkProcess/Downloads/soup/DownloadSoup.cpp:
(WebKit::Download::platformDidFinish):
(WebKit::Download::receivedCredential): Deleted.
(WebKit::Download::receivedRequestToContinueWithoutCredential): Deleted.
(WebKit::Download::receivedCancellation): Deleted.
(WebKit::Download::continueWithoutCredential): Deleted.
(WebKit::Download::useCredential): Deleted.
(WebKit::Download::cancelAuthenticationChallenge): Deleted.
(WebKit::Download::receivedRequestToPerformDefaultHandling): Deleted.
(WebKit::Download::receivedChallengeRejection): Deleted.
* PlatformEfl.cmake:
* PlatformGTK.cmake:
* PlatformMac.cmake:
* Shared/Authentication/AuthenticationManager.cpp:
(WebKit::AuthenticationManager::didReceiveAuthenticationChallenge):
(WebKit::AuthenticationManager::useCredentialForSingleChallenge):
(WebKit::AuthenticationManager::continueWithoutCredentialForChallenge):
(WebKit::AuthenticationManager::continueWithoutCredentialForSingleChallenge):
(WebKit::AuthenticationManager::cancelChallenge):
(WebKit::AuthenticationManager::cancelSingleChallenge):
(WebKit::AuthenticationManager::performDefaultHandling):
(WebKit::AuthenticationManager::performDefaultHandlingForSingleChallenge):
(WebKit::AuthenticationManager::rejectProtectionSpaceAndContinue):
(WebKit::AuthenticationManager::rejectProtectionSpaceAndContinueForSingleChallenge):
* Shared/Authentication/AuthenticationManager.h:
(WebKit::AuthenticationManager::outstandingAuthenticationChallengeCount):
* Shared/Authentication/cocoa: Added.
* Shared/Authentication/cocoa/AuthenticationManagerCocoa.mm: Added.
(WebKit::AuthenticationManager::receivedCredential):
(WebKit::AuthenticationManager::receivedRequestToContinueWithoutCredential):
(WebKit::AuthenticationManager::receivedCancellation):
(WebKit::AuthenticationManager::receivedRequestToPerformDefaultHandling):
(WebKit::AuthenticationManager::receivedChallengeRejection):
* Shared/Authentication/soup: Added.
* Shared/Authentication/soup/AuthenticationManagerSoup.cpp: Added.
(WebKit::AuthenticationManager::receivedCredential):
(WebKit::AuthenticationManager::receivedRequestToContinueWithoutCredential):
(WebKit::AuthenticationManager::receivedCancellation):
(WebKit::AuthenticationManager::receivedRequestToPerformDefaultHandling):
(WebKit::AuthenticationManager::receivedChallengeRejection):
* WebKit2.xcodeproj/project.pbxproj:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@196453 268f45cc-cd09-0410-ab3c-d52691b4dbfc