Fixing signature for new Event.

[zimbabao]

new Event need two parameters, one medatory and one optional.
event = new Event(typeArg, eventInit);

Ref: https://developer.mozilla.org/en-US/docs/Web/API/Event/Event

[msftclas]

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[mhegazy]

Thanks @zimbabao for your PR. the files in bin folder are built at build time using jake LKG. the sources come from src\lib. now the problem is this definition is comes from another auto generated file form IE specifications. this makes it easy for us to get automatically updated DOM specifications without having some one manually add new APIs. we are in the process of rewriting this script, and will make it public so you can update the scrip. so if you can bare with us a few weeks we should have something out.

[rgaunker]

@mhegazy : Thanks for the reply.
Also how about not checking in autogenerated files and make it part of build process.

[mhegazy]

That is exactly the change we are making :)