Bug 1367367 - handle exception caused by late error callbacks. r=esawin

MozReview-Commit-ID: 1xJ5S2wpHPd

--HG--
extra : rebase_source : 1136ca61408c9808eb20b5d6e4182716c0f914da

mobile/android/geckoview/src/main/java/org/mozilla/gecko/media/Codec.java

@@ -473,6 +473,8 @@ import org.mozilla.gecko.gfx.GeckoSurface;
         }
         try {
             mCallbacks.onError(error == Error.FATAL);
+        } catch (NullPointerException ne) {
+            // mCallbacks has been disposed by release().
         } catch (RemoteException re) {
             re.printStackTrace();
         }