wikimedia/WikipediaMobile — comment on commit 520eb09416ac8991a4fb586dd5a3a911cb6ab6ea
File:  line 0
By hartman:

Perhaps it also needs these stylings:

input[type=search]::-webkit-search-cancel-button,
input[type=search]::-webkit-search-decoration,
input[type=search]::-webkit-search-results-button,
input[type=search]::-webkit-search-results-decoration {
-webkit-appearance:none;
}

http://priyanksharma.com/blog/code-snippets/resetting-search-input-in-webkit/