Clean exported headers of the Debugger plugin.

Change-Id: I70ca6773e0f6aa6d80a441f8920d7f5d2418e1bf
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/debugger/debuggertooltipmanager.cpp

@@ -31,6 +31,7 @@
 #include "debuggertooltipmanager.h"
 #include "debuggerinternalconstants.h"
 #include "debuggerengine.h"
+#include "debuggerprotocol.h"
 #include "debuggeractions.h"
 #include "stackhandler.h"
 #include "debuggercore.h"