Move IEditor::createNew to IDocument::setContents

The method is for setting the contents, so it belongs to the document,
and should be named correspondingly.

Change-Id: I40363dc08f11268f530885b512e4a88e8b10d096
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/debugger/sourceagent.cpp

@@ -115,7 +115,7 @@ void SourceAgent::setContent(const QString &filePath, const QString &content)
         d->editor = qobject_cast<ITextEditor *>(
             EditorManager::openEditorWithContents(
                 CppEditor::Constants::CPPEDITOR_ID,
-                &titlePattern, content));
+                &titlePattern, content.toUtf8()));
         QTC_ASSERT(d->editor, return);
         d->editor->document()->setProperty(Debugger::Constants::OPENED_BY_DEBUGGER, true);