Rearrange the Window interface to match the many specs
Rearrange the Window interface to match the many specs

https://html.spec.whatwg.org/#the-window-object
and many other specs with partial Element interfaces.

To make reviewing easier, this commit only changes the order of lines
and adds comments. Actual spec sync will be done separately.

The order of the generated code changes, but there are no actual
changes.

BUG=460722

Review URL: https://codereview.chromium.org/988683002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@191435 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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