Utils: Remove unused signal from OutputFormatter

Change-Id: I337a78f9edf8b63869b117e031c648e52e3203a0
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/outputformatter.h

@@ -45,8 +45,6 @@ namespace Internal { class OutputFormatterPrivate; }
 
 class QTCREATOR_UTILS_EXPORT OutputFormatter : public QObject
 {
-    Q_OBJECT
-
 public:
     OutputFormatter();
     ~OutputFormatter() override;
@@ -63,9 +61,6 @@ public:
     void setBoldFontEnabled(bool enabled);
     static QTextCharFormat linkFormat(const QTextCharFormat &inputFormat, const QString &href);
 
-signals:
-    void contentChanged();
-
 protected:
     void initFormats();
     virtual void clearLastLine();

src/plugins/qtsupport/qtoutputformatter.cpp

@@ -220,8 +220,6 @@ void QtOutputFormatter::appendMessage(const QString &txt, const QTextCharFormat
         appendMessagePart(output.text, output.format);
 
     cursor().endEditBlock();
-
-    emit contentChanged();
 }
 
 void QtOutputFormatter::appendLine(const LinkResult &lr, const QString &line, OutputFormat format)