Revert "Remove children of title node before updating"

Revert "Remove children of title node before updating"

It causes performance problems. See
https://code.google.com/p/chromium/issues/detail?id=331076

Micro-benchmarks like http://jsperf.com/setting-document-title regress
about one magnitude.

We need to figure out whether the spec should change or if the CL
could be written in a less performance-intrusive way, or if it's a
performance penalty we accept. So revert for now.

The follow-up "Inhibit title updates when removing children before
setting new value" is reverted too since it has no value without the
first patch.

Reverted CLs:

https://codereview.chromium.org/128603002
https://codereview.chromium.org/107513013

BUG=331076
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=165117

[davve, 2014-01-14 15:51:04]

It seems the document.title stuff was too performance demanding for little gain
(spec compliance mostly). Back to the drawing board for now.

[jochen (gone - plz use gerrit), 2014-01-14 15:52:25]

sadness

lgtm

[commit-bot: I haz the power, 2014-01-15 07:34:57]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/davve@opera.com/138213005/1

[commit-bot: I haz the power, 2014-01-15 10:43:00]

Change committed as 165117