Clean headers in ProjectExplorer.

Change-Id: If61a8a91d2a39c5c97974a5bfcef91892b68d3f1
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/projectexplorer/codestylesettingspropertiespage.cpp

@@ -34,8 +34,6 @@
 #include <texteditor/icodestylepreferencesfactory.h>
 #include <texteditor/codestyleeditor.h>
 
-#include <QTextCodec>
-
 using namespace TextEditor;
 using namespace ProjectExplorer;
 using namespace ProjectExplorer::Internal;