Fix for bug #80239: javascript strict warnings in editor.js Simplify methods that check for existence of spellchecker and find components, by checking if they exist in Components.classes. r=cmanske@netscape.com sr=kin@netscape.com git-svn-id: svn://10.0.0.236/trunk@103130 18797224-902f-48f8-a5cc-f745e15eee43