Add back three deprecated DOM APIs removed from Chrome 34

Add back three deprecated DOM APIs removed from Chrome 34

I added back the APIs and marked them as deprecated.
I carefully checked to make sure they're using the
same UseCounter ids as they were before.
I did not add back the removed tests as it did not seem
worth the hassle of dealing with the conflicts and
rebaselines necessary due to the new deprecation messages.

These API removes are believed to have broken an unknown
number of Chrome users in enterprise environments.
Users in these settings are likely biased away from
having "anonymous chrome usage data" reporting enabled
meaning that their usage may not be reflected in the
data displayed at chromestatus.com.  All we have currently
is anecdotal data such as comments on mailing lists or
in bugs reporting "100s of customers" from SAP
as affected (crbug.com/364028).

These APIs were removed from Blink as "low hanging fruit".
Each of these sees fewer than 1 view of every 1 million
anonymously reported chrome views (well below our historical
removal thresholds) and removing them is a step towards the
larger removal of Attr nodes from the DOM (as has been
proposed for the DOM 4 specification).

However the reward for the 99.99% of users who do not use
these features is quite small. The risk to this unknown
number of Blink "enterprise" users is likely too large
to be worth the small code complexity reward at this time.

Adding these back for now, with deprecation messages.
We'll likely remove these again from Blink in the future
as usage of these features continues to decline and hopefully
our measurement of enterprise usage improves.

BUG=341830, 341296, 353104, 364028
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=171971

[abarth-chromium, 2014-04-18 19:19:56]

LGTM

https://codereview.chromium.org/243333003/diff/1/Source/core/frame/UseCounter...
File Source/core/frame/UseCounter.cpp (right):

https://codereview.chromium.org/243333003/diff/1/Source/core/frame/UseCounter...
Source/core/frame/UseCounter.cpp:714: return "'Document.createAttributeNS' is
deprecated and has been removed from DOM4 (w3.org/tr/dom).";
Can we give full URLs that clickable?  http://www.w3.org/TR/dom/

[eseidel, 2014-04-18 19:26:16]

The CQ bit was checked by eseidel@chromium.org

[commit-bot: I haz the power, 2014-04-18 19:26:24]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/eseidel@chromium.org/243333003/20001

[commit-bot: I haz the power, 2014-04-18 20:34:27]

Change committed as 171971