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/coreplugin/idocument.h

@@ -82,6 +82,8 @@ public:
     virtual ~IDocument();
 
     virtual bool save(QString *errorString, const QString &fileName = QString(), bool autoSave = false) = 0;
+    virtual bool setContents(const QByteArray &contents);
+
     QString filePath() const { return m_filePath; }
     virtual void setFilePath(const QString &filePath);
     QString displayName() const;