Enable gamepad API by default
Enable gamepad API by default

Turning on by default before M20 branch, but leaving flag code for now so that
it's just a one-liner to disable if necessary post-branch.

BUG=118552,112879

Review URL: http://codereview.chromium.org/10281003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@134823 0039d316-1c4b-4281-b951-d872f2087c98

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