Bug 1039048 - Don't eat IllegalArgumentExceptions in dispatchEvent. r=jchen

mobile/android/base/EventDispatcher.java

@@ -140,8 +140,6 @@ public final class EventDispatcher {
     }
 
     public void dispatchEvent(final NativeJSContainer message) {
-        EventCallback callback = null;
-        try {
         // First try native listeners.
         final String type = message.getString("type");
 
@@ -151,6 +149,7 @@ public final class EventDispatcher {
         }
 
         final String guid = message.optString(GUID, null);
+        EventCallback callback = null;
         if (guid != null) {
             callback = new GeckoEventCallback(guid, type);
         }
@@ -166,9 +165,7 @@ public final class EventDispatcher {
             // and return early. This assumption is checked when registering listeners.
             return;
         }
-        } catch (final IllegalArgumentException e) {
-            // Message doesn't have a "type" property, fallback to JSON
-        }
+
         try {
             // If we didn't find native listeners, try JSON listeners.
             dispatchEvent(new JSONObject(message.toString()), callback);