Skipping AX test related to input type on mac and android.

This is failing due to blink side CL. This will be fixed
with chromium side CL.

BUG=
NOTRY=true

Review URL: https://codereview.chromium.org/616003002

Cr-Commit-Position: refs/heads/master@{#297438}

content/test/data/accessibility/input-time-expected-android.txt

+#<skip --chromium dependancy>
 android.webkit.WebView focusable focused scrollable
     android.view.View
         android.view.View focusable input_type=36

content/test/data/accessibility/input-time-expected-mac.txt

+#<skip --chromium dependancy>
 AXWebArea AXRoleDescription='HTML content'
     AXGroup AXRoleDescription='group'
         AXUnknown AXRoleDescription='unknown'

content/test/data/accessibility/input-types-expected-android.txt

+#<skip --chromium dependancy>
 android.webkit.WebView focusable focused scrollable
     android.view.View
         android.view.View