Rename WKCertificateInfoGetPeerCertificates() to WKCertificateInfoGetCertificateChain()

Rename WKCertificateInfoGetPeerCertificates() to WKCertificateInfoGetCertificateChain()
https://bugs.webkit.org/show_bug.cgi?id=47495

Reviewed by Darin Adler.

WebKit2:

* Shared/API/c/mac/WKCertificateInfoMac.h:
Renamed WKCertificateInfoGetPeerCertificates() to WKCertificateInfoGetCertificateChain()
* Shared/API/c/mac/WKCertificateInfoMac.mm:
(WKCertificateInfoGetCertificateChain): Updated for name change.
* Shared/mac/PlatformCertificateInfo.h:
(WebKit::PlatformCertificateInfo::certificateChain): Renamed from peerCertificates()
* Shared/mac/PlatformCertificateInfo.mm:
(WebKit::PlatformCertificateInfo::PlatformCertificateInfo): Updated for name change.
(WebKit::PlatformCertificateInfo::encode): Ditto.
(WebKit::PlatformCertificateInfo::decode): Ditto.
(WebKit::PlatformCertificateInfo::dump): Ditto.

WebKitLibraries:

* WebKitSystemInterface.h:
* libWebKitSystemInterfaceLeopard.a:
* libWebKitSystemInterfaceSnowLeopard.a:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@69511 268f45cc-cd09-0410-ab3c-d52691b4dbfc