Output panes: Do not allocate extra standard formatters

The OutputWindow base class has a functioning default formatter these
days.

Change-Id: I0a75d0a081cdd2cfdd913388419483df836a53e9
Reviewed-by: hjk <hjk@qt.io>

src/plugins/projectexplorer/compileoutputwindow.h

@@ -34,20 +34,13 @@
 #include <QPair>
 
 QT_BEGIN_NAMESPACE
-class QPlainTextEdit;
-class QTextCharFormat;
 class QToolButton;
 QT_END_NAMESPACE
 
-namespace Utils { class OutputFormatter; }
-
 namespace ProjectExplorer {
-
-class BuildManager;
 class Task;
 
 namespace Internal {
-
 class ShowOutputTaskHandler;
 class CompileOutputTextEdit;
 
@@ -98,7 +91,6 @@ private:
     ShowOutputTaskHandler *m_handler;
     QToolButton *m_cancelBuildButton;
     QToolButton * const m_settingsButton;
-    Utils::OutputFormatter *m_formatter;
     CompileOutputSettings m_settings;
 };