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/kit.cpp

@@ -29,15 +29,9 @@
 
 #include "kit.h"
 
-#include "devicesupport/devicemanager.h"
-#include "kitinformation.h"
 #include "kitmanager.h"
-#include "project.h"
-#include "toolchainmanager.h"
 #include "ioutputparser.h"
 
-#include <utils/qtcassert.h>
-
 #include <QApplication>
 #include <QIcon>
 #include <QStyle>