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/texteditor/texteditoractionhandler.cpp

@@ -49,8 +49,9 @@
 using namespace TextEditor;
 using namespace TextEditor::Internal;
 
-TextEditorActionHandler::TextEditorActionHandler(Core::Id contextId, uint optionalActions)
-  : QObject(Core::ICore::instance()),
+TextEditorActionHandler::TextEditorActionHandler(QObject *parent, Core::Id contextId,
+                                                 uint optionalActions)
+  : QObject(parent),
     m_undoAction(0),
     m_redoAction(0),
     m_copyAction(0),