Sync the NamedNodeMap interface with the spec

Sync the NamedNodeMap interface with the spec

https://dom.spec.whatwg.org/#interface-namednodemap

There are no changes to the generated code other than the order.

The spec uses namespace as the argument name, but that causes the
generated code to not compile, since it is a C++ keyword:
https://www.w3.org/Bugs/Public/show_bug.cgi?id=28093

BUG=460722
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=190801

[philipj_slow, 2015-02-24 16:51:47]

philipj@opera.com changed reviewers:
+ haraken@chromium.org

[philipj_slow, 2015-02-24 16:51:48]

PTAL

[haraken, 2015-02-24 17:01:23]

LGTM

[philipj_slow, 2015-02-24 17:30:59]

The CQ bit was checked by philipj@opera.com

[commit-bot: I haz the power, 2015-02-24 17:32:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/952863003/1

[commit-bot: I haz the power, 2015-02-24 19:17:05]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-02-24 19:17:06]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/52156)

[philipj_slow, 2015-02-25 03:23:40]

The CQ bit was checked by philipj@opera.com

[commit-bot: I haz the power, 2015-02-25 03:24:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/952863003/1

[commit-bot: I haz the power, 2015-02-25 04:27:20]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=190801