Tested in Cordova 3.3.1 on a Blackberry Z10
If the InAppBrowser plugin is included in the project (required for iOS and Android versions for instance), then when building the BB10 version the js file for the plugin is copied over to the www folder.
With the plugin's JS file present the Child Browser refuses to open throwing:
TypeError: 'undefined' is not an object (evaluating 'event.type');
for InAppBrowser.js line 39.
With the plugin removed, the native Child Browser functions as expected.
Suspect this is related to https://issues.apache.org/jira/browse/CB-4467