Revert erroneous changes made to UIProcess/API/Cocoa in r165676.
* UIProcess/API/Cocoa/WKBackForwardList.h:
* UIProcess/API/Cocoa/WKBackForwardListItem.h: Copied from Source/WebKit2/UIProcess/API/Cocoa/WKBackForwardListItem.h.
* UIProcess/API/Cocoa/WKNavigation.h:
* UIProcess/API/Cocoa/WKNavigationAction.h: Copied from Source/WebKit2/UIProcess/API/Cocoa/WKNavigationAction.h.
* UIProcess/API/Cocoa/WKNavigationDelegate.h:
(NS_ENUM):
* UIProcess/API/Cocoa/WKNavigationResponse.h: Copied from Source/WebKit2/UIProcess/API/Cocoa/WKNavigationResponse.h.
* UIProcess/API/Cocoa/WKNavigationTrigger.h: Removed.
* UIProcess/API/Cocoa/WKWebView.h:
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@165678
268f45cc-cd09-0410-ab3c-
d52691b4dbfc