Not necessary to forward class if we include file

src/dolphinbookmarkhandler.h

@@ -14,7 +14,6 @@
 class DolphinMainWindow;
 class DolphinViewContainer;
 class KActionCollection;
-class KBookmarkManager;
 class KBookmarkMenu;
 class QMenu;
 

src/dolphinmainwindow.h

@@ -37,7 +37,6 @@ class KNewFileMenu;
 class KHelpMenu;
 class KToolBarPopupAction;
 class QToolButton;
-class QIcon;
 class PlacesPanel;
 class TerminalPanel;
 

src/dolphinviewcontainer.h

@@ -28,7 +28,6 @@ namespace KActivities {
 class FilterBar;
 class KMessageWidget;
 class QUrl;
-class KUrlNavigator;
 class DolphinSearchBox;
 class DolphinStatusBar;