Normalize indentation in Element.idl
Normalize indentation in Element.idl

The DOM Level 2 Core block was very weird, so re-indent things
to have some kind of consistency in indentation and line length.

BUG=none

Review URL: https://codereview.chromium.org/31373003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@160088 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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