Remove Chromium code from WebCore/editing
https://bugs.webkit.org/show_bug.cgi?id=114008

Reviewed by Benjamin Poulain.

Removed.

* editing/EditingBehavior.h:
(WebCore::EditingBehavior::shouldAllowSpellingSuggestionsWithoutSelection):
* editing/FrameSelection.h:
(WebCore):
* editing/chromium: Removed.
* editing/chromium/EditorChromium.cpp: Removed.
* editing/chromium/FrameSelectionChromium.cpp: Removed.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147721 268f45cc-cd09-0410-ab3c-d52691b4dbfc