Eliminate the Editor::newGeneralClipboard function
https://bugs.webkit.org/show_bug.cgi?id=116410

Reviewed by Andreas Kling.

This is one of the clean-ups made possible by the changes to the DOM clipboard class.
I had been waiting until all the platforms were moved over to it, but it turns out to be
easy to do this now, just with #ifdefs.

* PlatformBlackBerry.cmake: Deleted EditorBlackBerry.cpp.

* editing/Editor.cpp:
(WebCore::Editor::dispatchCPPEvent): Call Clipboard::createForCopyAndPaste directly when
using the new version of the Clipboard class. Also some small style cleanup nearby.

* editing/blackberry/EditorBlackBerry.cpp: Removed. The only function in this file was
newGeneralClipboard.

* editing/mac/EditorMac.mm: Deleted newGeneralClipboard.
* platform/efl/ClipboardEfl.cpp: Ditto.
* platform/gtk/ClipboardGtk.cpp: Ditto.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@150351 268f45cc-cd09-0410-ab3c-d52691b4dbfc