-webkit-box-sizing not needed since Chrome 10 and Safari 6
-webkit-box-shadown not needed since Chrome 10 and Safari 6
WikiaMobile: remove -webkit-box-shadow
extensions/wikia: get rid of -webkit-box-sizing CSS property
Revert "WikiaMobile: remove -webkit-box-shadow"

This reverts commit 050630ae9d479bea16288278460aa5e6eb28d36a.
Merge branch 'dev' into webkit-box-sizing-not-needed

Conflicts:
	extensions/wikia/RegexBlock/RegexBlock.css
	extensions/wikia/WikiaPhotoGallery/css/WikiaPhotoGallery.editor.css
Merge pull request #5066 from Wikia/webkit-box-sizing-not-needed

CON-1658: remove outdated -webkit CSS browser prefixes