Remove redundant casts

Change-Id: I80b73b653e97904605dc62484a7448f3bfbf7211

server/src/main/java/com/vaadin/event/dd/acceptcriteria/SourceIs.java

@@ -63,8 +63,8 @@ public class SourceIs extends ClientSideCriterion {
     @Override
     public boolean accept(DragAndDropEvent dragEvent) {
         if (dragEvent.getTransferable() instanceof TransferableImpl) {
-            Component sourceComponent = ((TransferableImpl) dragEvent
-                    .getTransferable()).getSourceComponent();
+            Component sourceComponent = dragEvent
+                .getTransferable().getSourceComponent();
             for (Component c : components) {
                 if (c == sourceComponent) {
                     return true;

server/src/main/java/com/vaadin/event/dd/acceptcriteria/SourceIsTarget.java

@@ -46,8 +46,8 @@ public class SourceIsTarget extends ClientSideCriterion {
     @Override
     public boolean accept(DragAndDropEvent dragEvent) {
         if (dragEvent.getTransferable() instanceof TransferableImpl) {
-            Component sourceComponent = ((TransferableImpl) dragEvent
-                    .getTransferable()).getSourceComponent();
+            Component sourceComponent = dragEvent
+                .getTransferable().getSourceComponent();
             DropTarget target = dragEvent.getTargetDetails().getTarget();
             return sourceComponent == target;
         }

server/src/main/java/com/vaadin/server/communication/ClientRpcWriter.java

@@ -131,8 +131,8 @@ public class ClientRpcWriter implements Serializable {
                 for (int destIndex = 0, oldIndex = 0, paintableIndex = 0; destIndex < totalCalls; destIndex++) {
                     if (paintableIndex >= paintablePendingRpc.size()
                             || (oldIndex < oldPendingRpc.size()
-                                    && ((Comparable<ClientMethodInvocation>) oldPendingRpc
-                                            .get(oldIndex)).compareTo(
+                                    && oldPendingRpc
+                                        .get(oldIndex).compareTo(
                                                     paintablePendingRpc.get(
                                                             paintableIndex)) <= 0)) {
                         pendingInvocations.add(oldPendingRpc.get(oldIndex++));