Add missing header guards

Change-Id: I67d0040c2e9f00e8a7b842ac1228212c0e93873c
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>

src/core/renderer/content_renderer_client_qt.h

@@ -33,6 +33,8 @@
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/
+#ifndef CONTENT_RENDERER_CLIENT_QT_H
+#define CONTENT_RENDERER_CLIENT_QT_H
 
 #include "content/public/renderer/content_renderer_client.h"
 
@@ -61,3 +63,5 @@ public:
 private:
     QScopedPointer<visitedlink::VisitedLinkSlave> m_visitedLinkSlave;
 };
+
+#endif // CONTENT_RENDERER_CLIENT_QT_H

src/core/renderer/qt_render_view_observer.h

@@ -33,6 +33,8 @@
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/
+#ifndef QT_RENDER_VIEW_OBSERVER_H
+#define QT_RENDER_VIEW_OBSERVER_H
 
 #include "content/public/renderer/render_view_observer.h"
 
@@ -52,3 +54,5 @@ private:
 
     DISALLOW_COPY_AND_ASSIGN(QtRenderViewObserver);
 };
+
+#endif // QT_RENDER_VIEW_OBSERVER_H