QmlProfiler: Remove use of Qt private headers

Use the copy of QDeclarativeDebugClient we ship with qtcreator.
However, since the internal one misses a waitForConnected any connection
will right now fail.

src/plugins/qmlprofiler/tracewindow.h

@@ -37,7 +37,7 @@
 #include <QtCore/qpointer.h>
 #include <QtGui/qwidget.h>
 
-#include <QtDeclarative/private/qdeclarativedebugclient_p.h>
+#include <qmljsdebugclient/qdeclarativedebugclient_p.h>
 
 
 QT_BEGIN_NAMESPACE
@@ -50,6 +50,8 @@ class QPushButton;
 class QDeclarativeView;
 QT_END_NAMESPACE
 
+using QmlJsDebugClient::QDeclarativeDebugConnection;
+
 namespace QmlProfiler {
 namespace Internal {