crosswalk-project/crosswalk — pull request #2029 by sqliu (2014-06-03 09:11:08+00:00)
Title: [Android] Fix null callback issue in XWalkView.evaluateJavaScript.

In case that the callback is a `null` value, XWalkView should behave normally and
same as Android WebView.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1815