Clean exported headers of the CppTools plugin.

Change-Id: I0144ac33e88980c431c54a6d69bbde28da4b1967
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/cpptools/cpprefactoringchanges.h

@@ -32,12 +32,11 @@
 #define CPPREFACTORINGCHANGES_H
 
 #include "cpptools_global.h"
-#include "cppmodelmanager.h"
+
+#include <cplusplus/CppDocument.h>
 
 #include <texteditor/refactoringchanges.h>
 
-#include <cplusplus/LookupContext.h>
-
 namespace CppTools {
 
 class CppRefactoringChanges;