Don't create an empty text node when setting document.title to the empty string

Don't create an empty text node when setting document.title to the empty string

http://www.whatwg.org/specs/web-apps/current-work/#document.title
http://www.whatwg.org/specs/web-apps/current-work/#the-title-element

now both refer to:

http://dom.spec.whatwg.org/#dom-node-textcontent

for how the empty string should handled: empty string -> no child
element. Note that the act of updating the document's copy of the
title then falls on the removeChildren() call.

Since FF and IE10 already follows the spec, web compatibility risk
should be small.

BUG=336154
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=165453

[davve, 2014-01-20 14:43:49]

One more little document.title patch, Jochen. Follow-up to

https://groups.google.com/a/chromium.org/d/msg/blink-dev/ONBQQ5uhBik/k69txD96...

I think we're pretty much spec compliant for setting document.title after this.

[jochen (gone - plz use gerrit), 2014-01-20 19:22:00]

lgtm

https://codereview.chromium.org/143363002/diff/1/LayoutTests/fast/dom/documen...
File LayoutTests/fast/dom/document-set-title-no-child-on-empty.html (right):

https://codereview.chromium.org/143363002/diff/1/LayoutTests/fast/dom/documen...
LayoutTests/fast/dom/document-set-title-no-child-on-empty.html:5: <script>
nit 4 spaces indent

[commit-bot: I haz the power, 2014-01-21 10:16:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/davve@opera.com/143363002/60001

[commit-bot: I haz the power, 2014-01-21 11:12:46]

Change committed as 165453