Remove an unnecessary sanity check

 This is causing issues with MotionEvents built by various tools such
 as DRT. The check itself doesn't seem strictly necessary, and it is
 easier to remove the check than fix all the tools and tests

Change-Id: I74bf85307956b5858042fbe23f87ed2b87132f17

Author: jreck

core/java/android/webkit/WebViewInputDispatcher.java

@@ -269,9 +269,8 @@ public void setWebKitWantsTouchEvents(boolean enable) {
      */
     public boolean postPointerEvent(MotionEvent event,
             int webKitXOffset, int webKitYOffset, float webKitScale) {
-        if (event == null
-                || (event.getSource() & InputDevice.SOURCE_CLASS_POINTER) == 0) {
-            throw new IllegalArgumentException("event must be a pointer event");
+        if (event == null) {
+            throw new IllegalArgumentException("event cannot be null");
         }
 
         if (DEBUG) {