webview.preload fails when webSecurity is disabled

webview preload attribute seems to be broken in Electron 1.2.0/Chrome 51 (worked with 1.1.3/Chrome 50).

Here is how I used it (successfully) on versions prior to 1.2.0:
@webview.preload = "file://#{app.getAppPath()}/js/player-preload.js"

Tried to put it in the HTML webview tag directly as attribute, same thing.

Note: No error in the Console though, it's just that the script is never actually executed.

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