Use the NON generic version of getAdapter in WebViewPart

The generic version has been introduced in Mars, but in order to make
this class usable also in Indigo and Kepler we need to go back to the
non generic version of getAdapter

Change-Id: Ifec1422f4b9bb72e700a44ca39720fcd9cd95298

plugins/org.eclipse.emf.parsley.web.servlets/src/org/eclipse/emf/parsley/web/servlets/WebViewPart.java

@@ -1,3 +1,13 @@
+/*******************************************************************************
+ * Copyright (c) 2015 RCP Vision (http://www.rcp-vision.com) and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Contributors:
+ * Vincenzo Caselli - Initial contribution and API
+ *******************************************************************************/
 package org.eclipse.emf.parsley.web.servlets;
 
 import org.eclipse.swt.graphics.Image;
@@ -51,8 +61,8 @@ public void removePropertyListener(IPropertyListener listener) {
 	public void setFocus() {
 	}
 
-	@Override
-	public <T> T getAdapter(Class<T> adapter) {
+	@SuppressWarnings({ "rawtypes", "unchecked" })
+	public Object getAdapter(Class adapter) {
 		return null;
 	}