PluginArray: real browsers expose a native PluginArray type. navigator.plugins
was returning a plain Array, so `navigator.plugins instanceof PluginArray` and
`navigator.plugins[0].toString()` (which should return [object Plugin]) were
failing sannysoft-style checks. Adds a PluginArray constructor whose prototype
inherits from Array.prototype, with Symbol.toStringTag='PluginArray'. Each
plugin entry now carries Symbol.toStringTag='Plugin' so Object.prototype.toString
returns [object Plugin].
webdriver: moved the webdriver getter off the navigator instance and onto a
thin prototype so Object.getOwnPropertyDescriptor(navigator, 'webdriver')
returns undefined, matching Chrome where the property lives on Navigator.prototype.
Getter is marked native. sannysoft "WebDriver (New)" now reports "missing (passed)".
SGavrl
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