GitLab

Turn on ENABLE_NEW_GAMEPAD_API flag so that the new gamepad code is used.
Also remove the old code on Chromium side. The ENABLE_NEW_GAMEPAD_API is only
needed until the Blink side #ifdefs are removed.

BUG=344556

Review URL: https://codereview.chromium.org/289423004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272723 0039d316-1c4b-4281-b951-d872f2087c98