Fixes wrong inheritance of PrefSelect.

PrefSelect must inherit from HTMLSelectElement, otherwise it will be
broken when the DOM attributes are moved to prototype chains.

Note that HTMLSelectElement does NOT inherit from HTMLInputElement, so
it's simply wrong that PrefSelect inherits from HTMLInputElement.

BUG=43394

Review URL: https://codereview.chromium.org/1061263004

Cr-Commit-Position: refs/heads/master@{#327023}
1 file changed