use function bind operator for hasOwn

[alkhe]

In our case, a.call(b, ...args) is the same as b::a(...args)

[gaearon]

Hey, thanks for PR. :-)

These functions are actually no longer in Redux because that React connectors that depend on them are now in http://github.com/gaearon/react-redux. Also, we're not using :: syntax in core code anymore because we started using Flow (#254) which can't parse them yet.