[WebEditingTester] @properties, dot syntax, and remember the window position

[WebEditingTester] @properties, dot syntax, and remember the window position
https://bugs.webkit.org/show_bug.cgi?id=141843

Reviewed by Tim Horton.

Modernize a bit with more dot syntax, use @property for the web views,
and give the main window an Autosave name so it remembers the widow position.

* WebEditingTester/WK1WebDocumentController.m:
(-[WK1WebDocumentController awakeFromNib]):
(-[WK1WebDocumentController loadHTMLString:]):
* WebEditingTester/WK2WebDocumentController.m:
(-[WK2WebDocumentController awakeFromNib]):
* WebEditingTester/WebDocument.xib:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@180436 268f45cc-cd09-0410-ab3c-d52691b4dbfc