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/vcsbase/submiteditorfile.cpp

@@ -54,6 +54,11 @@ SubmitEditorFile::SubmitEditorFile(const QString &mimeType, VcsBaseSubmitEditor
     setTemporary(true);
 }
 
+bool SubmitEditorFile::setContents(const QByteArray &contents)
+{
+    return m_editor->setFileContents(contents);
+}
+
 void SubmitEditorFile::setModified(bool modified)
 {
     if (m_modified == modified)