Revert 245093 "Flag-flip of app-list-voice-search. Now it's on b..."

This flag flip accidentally shows the UI in Windows
but it should not.

> Flag-flip of app-list-voice-search. Now it's on by default.
> 
> BUG=333914
> R=xiyuan@chromium.org
> TEST=manually
> 
> Review URL: https://codereview.chromium.org/139293007

TBR=mukai@chromium.org

Review URL: https://codereview.chromium.org/139293012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245184 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245184