Android 3.0 and 4.0 do not support the HTML5 history API (http://caniuse.com/#search=history). Is there any reason to refuse support, since Android 2.2 and 2.3 are supported?
I assume they missed updating the url when webkit internally changes it. In browser 3.0, it seems like a complete (mostly at least) rewrite of browser 2.3.3.
I reported this to the Androids tracker at least: http://code.google.com/p/android/issues/detail?id=23979