To update, looks like the new version (0.3.3) of the InAppBrowser plugin only compiles with PhoneGap 3.3.0 (despite its plugin.xml). So either lock your inappbrowser plugin to the old version:
or update your app to use the latest version of PhoneGap and the new InAppBrowser:
<gap:plugin name="org.apache.cordova.inappbrowser" version="0.2.4" />
or update your app to use the latest version of PhoneGap and the new InAppBrowser:
<preference name="phonegap-version" value="3.3.0" />

