Review comments followup

These are review comments followup from ag/17399997

Bug: b/218187058
Test: manually test thet Launcher3 features work correctly
Change-Id: I9865a37c1ed663370dc28e7678994f3d961e3cd1

src/com/android/launcher3/DropTargetBar.java

@@ -179,7 +179,7 @@ public class DropTargetBar extends FrameLayout
         }
 
         Launcher launcher = Launcher.getLauncher(getContext());
-        Workspace workspace = launcher.getWorkspace();
+        Workspace<?> workspace = launcher.getWorkspace();
         DeviceProfile dp = launcher.getDeviceProfile();
         int buttonHorizontalPadding = dp.dropTargetHorizontalPaddingPx;
         int buttonVerticalPadding = dp.dropTargetVerticalPaddingPx;