- minor cleanup of plug-in-related classes in ECMA directory

        * khtml/ecma/kjs_navigator.cpp: Remove unneeded PluginBase member functions
	ref() and deref(). Instead just make Plugin and MimeType both derive from
	PluginBase and remove APPLE_CHANGES.
        (Navigator::getValueProperty): Don't use "Konqueror" for the fallback.
	Just return Undefined() for that case since we will never reach it anyway.

	- simplify the logic in khtmlMoveMouseEvent so it's easier to decipher

        * kwq/KWQKHTMLPart.mm: (KWQKHTMLPart::khtmlMouseMoveEvent): By merging two
	identical if statements, the logic of this function becomes much clearer.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@3305 268f45cc-cd09-0410-ab3c-d52691b4dbfc