[WebEditingTester] ARC-ify WebEditingTester

[WebEditingTester] ARC-ify WebEditingTester
https://bugs.webkit.org/show_bug.cgi?id=141827

Reviewed by Sam Weinig.

* WebEditingTester/AppDelegate.m:
(-[WebEditingAppDelegate showOperations:]):
* WebEditingTester/EditingOperations.m:
(editingOperations):
* WebEditingTester/WK1WebDocumentController.m:
(-[WK1WebDocumentController dealloc]): Deleted.
* WebEditingTester/WK2WebDocumentController.m:
(-[WK2WebDocumentController dealloc]): Deleted.
* WebEditingTester/WebEditingTester.xcodeproj/project.pbxproj:
Turn on ARC and remove a few retain/release/autorelease calls.
We don't need to implement dealloc in either document controller
because WebView and WKWebView's UIDelegate property does not hold a
strong reference.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@180427 268f45cc-cd09-0410-ab3c-d52691b4dbfc