[GTK] Remove WebKitCertificateInfo from WebKit2GTK+ API

[GTK] Remove WebKitCertificateInfo from WebKit2GTK+ API
https://bugs.webkit.org/show_bug.cgi?id=134830

Reviewed by Gustavo Noronha Silva.

Source/WebKit2:
It was added to make the API more convenient but it has ended up
making it more complicated. WebKitWebView::load-failed-with-tls-errors
now receives a GTlsCertificate + GTlsCertificateFlags and
webkit_web_context_allow_tls_certificate_for_host() receives a GTlsCertificate
since the errors are not actually needed. This makes the API more
consistent with the existing method webkit_web_view_get_tls_info().

* PlatformGTK.cmake: Remove files from compilation.
* UIProcess/API/gtk/WebKitCertificateInfo.cpp: Removed.
* UIProcess/API/gtk/WebKitCertificateInfo.h: Removed.
* UIProcess/API/gtk/WebKitCertificateInfoPrivate.h: Removed.
* UIProcess/API/gtk/WebKitWebContext.cpp:
(webkit_web_context_allow_tls_certificate_for_host):
* UIProcess/API/gtk/WebKitWebContext.h:
* UIProcess/API/gtk/WebKitWebView.cpp:
(webkit_web_view_class_init):
(webkitWebViewLoadFailedWithTLSErrors):
* UIProcess/API/gtk/WebKitWebView.h:
* UIProcess/API/gtk/docs/webkit2gtk-docs.sgml:
* UIProcess/API/gtk/docs/webkit2gtk-sections.txt:
* UIProcess/API/gtk/webkit2.h:

Tools:
Update the SSL test for the API changes.

* TestWebKitAPI/Tests/WebKit2Gtk/TestSSL.cpp:
(testLoadFailedWithTLSErrors):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@171792 268f45cc-cd09-0410-ab3c-d52691b4dbfc