[whatwg/dom] initEvent should not require three parameters (#387)

I have found many instances of web content calling initEvent with only one parameter.  Matching the current spec makes these pages not work, showing up as unresponsive blank white pages.

I therefore propose changing this:
void initEvent(DOMString type, boolean bubbles, boolean cancelable); // historical
to this:
void initEvent(DOMString type, optional boolean bubbles = false, optional boolean cancelable = false); // historical

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