For calling some methods of mRules from EditorBase, let's move mRules member
from TextEditor to EditorBase.
Unfortunately, TextEditRules.h depends on EditAction which is declared in
EditorBase.h and that caused unnecessary include hell of EditorBase.h. So,
let's move it to an independent header file.
MozReview-Commit-ID: 5HiSZLP9WHH
--HG--
extra : rebase_source : 3e2c40385a6f3d6d1e03ef4e213434383bb37d5f
Masayuki Nakano