Implement WindowEventHandlers

Implement WindowEventHandlers

Spec: http://whatwg.org/html#windoweventhandlers

This is mostly refactoring, but there are Web-facing changes for
onmessage, onpageshow and onpagehide, which were not correctly handled.

Drop the "Not implemented yet" blocks. onafterprint and onbeforeprint
are listed in WindowEventHandlers.idl, while onredo and onundo are
not in the spec.

BUG=305112
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=160816

[philipj_slow, 2013-10-28 12:03:57]

This should be the last in the long line of CLs for
http://code.google.com/p/chromium/issues/detail?id=305112

[tkent, 2013-10-29 08:13:17]

lgtm.

I recommend you mention removal of onredo and onundo in the CL description.  I
had to investigate the reason in this review.

[philipj_slow, 2013-10-29 08:23:44]

On 2013/10/29 08:13:17, tkent wrote:
> lgtm.
> 
> I recommend you mention removal of onredo and onundo in the CL description.  I
> had to investigate the reason in this review.

Done. Thanks for the review!

[commit-bot: I haz the power, 2013-10-29 08:24:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/48603002/1

[commit-bot: I haz the power, 2013-10-29 09:21:08]

Change committed as 160816