Re: [whatwg/dom] Standardize certain Microsoft event extensions (#334)

Regarding the constants, we have these in Blink's Event.idl:
```WebIDL
    const unsigned short MOUSEDOWN = 1;
    const unsigned short MOUSEUP   = 2;
    const unsigned short MOUSEOVER = 4;
    const unsigned short MOUSEOUT  = 8;
    const unsigned short MOUSEMOVE = 16;
    const unsigned short MOUSEDRAG = 32;
    const unsigned short CLICK     = 64;
    const unsigned short DBLCLICK  = 128;
    const unsigned short KEYDOWN   = 256;
    const unsigned short KEYUP     = 512;
    const unsigned short KEYPRESS  = 1024;
    const unsigned short DRAGDROP  = 2048;
    const unsigned short FOCUS     = 4096;
    const unsigned short BLUR      = 8192;
    const unsigned short SELECT    = 16384;
    const unsigned short CHANGE    = 32768;
```

But they make no sense, they're not used for anything. Would be happy to see them in an historical.html test to provide some small incentive for them to be removed.

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