Give TextEditorActionHandler an explicit parent and unify usage.

The action handler implicitly passed ownership to ICore, which is non-
to the action handler. We now consistently create the action handler in
the editor factory, give ownership to the editor factory, and don't hold
a reference to it.

Change-Id: I4372f8de966e3ceff87c06c5528c6b54522c1d57
Reviewed-by: David Schulz <david.schulz@digia.com>

src/plugins/genericprojectmanager/genericprojectplugin.cpp

@@ -46,7 +46,6 @@
 #include <projectexplorer/projectexplorer.h>
 #include <projectexplorer/selectablefilesmodel.h>
 
-#include <texteditor/texteditoractionhandler.h>
 
 #include <QtPlugin>
 #include <QDebug>
@@ -75,8 +74,6 @@ bool GenericProjectPlugin::initialize(const QStringList &, QString *errorMessage
 
     Manager *manager = new Manager;
 
-    new TextEditor::TextEditorActionHandler(Constants::C_FILESEDITOR); // owned by ICore
-
     m_projectFilesEditorFactory = new ProjectFilesFactory(manager);
     addObject(m_projectFilesEditorFactory);