Bug 581856: Remove the deprecated DisplayType.AREA

Deprecated in commit b21c267, since v8.0.0.

[Removed] o.e.t.tmf.core.model.xy.ISeriesModel.DisplayType.AREA

Change-Id: Iecf711e75f8348b6cf087f2845e2c8d143db3aa9
Signed-off-by: Marco Miller <marco.miller@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/c/tracecompass/org.eclipse.tracecompass/+/201593
Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>

tmf/org.eclipse.tracecompass.tmf.core/src/org/eclipse/tracecompass/tmf/core/model/xy/ISeriesModel.java

@@ -40,14 +40,7 @@ public enum DisplayType {
         /**
          * Scatter
          */
-        SCATTER,
-        /**
-         * Area
-         *
-         * @deprecated As currently unused, at least in o.e.tracecompass.
-         */
-        @Deprecated
-        AREA
+        SCATTER
     }
 
     /**