Revert 137239 - Revert 134823 - Enable gamepad API by default
Revert 137239 - Revert 134823 - Enable gamepad API by default

(This re-enables by default, it was only supposed to be off on M20 branch)

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

TBR=scottmg@chromium.org
Review URL: https://chromiumcodereview.appspot.com/10310173

TBR=scottmg@google.com
Review URL: https://chromiumcodereview.appspot.com/10386191

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@137663 0039d316-1c4b-4281-b951-d872f2087c98

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