Skipping AX test on Android.

Will fix this test once the chromium side changes for this
issue will be merged 169574.

BUG=169574

Review URL: https://codereview.chromium.org/612563004

Cr-Commit-Position: refs/heads/master@{#297153}

content/test/data/accessibility/input-button-in-menu-expected-android.txt

+#<skip -- Need to generate correct expectations>
 android.webkit.WebView focusable focused scrollable
     android.view.View
         android.widget.Button clickable focusable name='Button in menu element'