- implemented user-agent spoofing as described in bug 3044569

        * WebView.subproj/WebController.m: (-[WebController userAgentForURL:]):
	Find the suffix of the host name that contains exactly one dot, lower-case it,
	and look it up in the user-agent spoof table. For now, anything in the table
	pretends to be MacIE. Don't fret that this table is simple. We will complicate it
	as needed. The technique is flexible, even though it may not look it now.

        * WebView.subproj/WebControllerPrivate.h: Add userAgentWhenPretendingToBeMacIE field.
        * WebView.subproj/WebControllerPrivate.m:
        (-[WebControllerPrivate dealloc]): Release userAgentWhenPretendingToBeMacIE.
        (-[WebController _defaultsDidChange]): Release and nil userAgentWhenPretendingToBeMacIE.

        * Makefile.am: Added rules to build WebUserAgentSpoofTable.c using gperf.
        * WebView.subproj/WebUserAgentSpoofTable.c: Added. Generated file.
        * WebView.subproj/WebUserAgentSpoofTable.gperf: Added. Table

        * English.lproj/StringsNotToBeLocalized.txt: Update for above changes.

	- fixed a crash I saw in a simplistic way

        * WebView.subproj/WebHTMLViewPrivate.m: (-[WebHTMLView _elementAtPoint:]):
	Don't assert if the webFrame is nil, just return a partial dictionary.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@3073 268f45cc-cd09-0410-ab3c-d52691b4dbfc