scrollview: Ignore Scrollbars test on Android 4.4+

This test is a known failure on Android 4.4.x, due to how Chrome
for Android now adds additional padding pixels to the ScrollView's
`boundingBox`.

This doesn't affect the general use case, though this test and the
one above it should likely be refactored.
yui: Fix skin tests for latest Chrome/Android

New Chrome and Android use the full value declaration for
font properties such as `textDecoration`. They return:

`underline solid rgb(0, 0, 0)`

Instead of just:

`underline`