Clean exported headers of the CppTools plugin.

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

src/plugins/cpptools/cppcompletionassistprovider.h

@@ -36,12 +36,12 @@
 #include <texteditor/codeassist/assistenums.h>
 #include <texteditor/codeassist/completionassistprovider.h>
 
-#include <cplusplus/Token.h>
-
 QT_BEGIN_NAMESPACE
 class QTextDocument;
 QT_END_NAMESPACE
 
+namespace CPlusPlus { struct LanguageFeatures; }
+
 namespace TextEditor {
 class BaseTextEditor;
 class AssistInterface;