Remove --enable-input-mode-attribute flag

Enable the "inputmode" HTML5 attribute via Blink's
experimental feature flag.

BUG=244688
TBR=jam@chromium.org

Review URL: https://codereview.chromium.org/170293002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252265 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed