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This reverts commit f3f5e27d.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 509533 as the
culprit for failures in the build cycles as shown on:
https://findit-for-me.appspot.com/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtL2YzZjVlMjdkYjE2YmU1NWNhZjY0MmIyMjc0ZjhjZmU2ZWIzOGU0ZjQM

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.webkit/WebKit%20Mac%20Builder%20%28dbg%29/218396

Original change's description:
> Allow Chrome on Mac to recognize multiple MFi gamepads
> 
> Chrome for Mac recognizes "Made for iOS" (MFi) gamepads enumerated
> by the GameController framework. When multiple such devices are
> connected at once, Chrome fails to properly distinguish them.
> 
> GCController exposes a playerIndex field that defaults to the value
> GCControllerPlayerIndexUnset (-1). The application may set this field
> to a value between 0 and 3 to signal which LEDs should be lit on the
> gamepad. Chrome also uses this field to distinguish gamepads, but does
> not set the index to a unique value. This causes the first-connected
> gamepad to shadow any other connected gamepads.
> 
> This CL ensures each connected MFi gamepad is assigned a unique player
> index up to the OS-defined limit of four.
> 
> BUG=775270
> 
> Change-Id: Ieb852cadc5ff36f94aa1003de3f2e13538114661
> Reviewed-on: https://chromium-review.googlesource.com/723852
> Reviewed-by: Brandon Jones <bajones@chromium.org>
> Commit-Queue: Matt Reynolds <mattreynolds@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#509533}

No-Presubmit: true
No-Tree-Checks: true
No-Try: true
BUG=775270

Change-Id: Ie8a0af7a186753a385d138080ddb70815d992ae5
Reviewed-on: https://chromium-review.googlesource.com/724165
Cr-Commit-Position: refs/heads/master@{#509546}