Remove SVGElement.xmlbase/xmlspace/xmllang and no use codes.

Remove SVGElement.xmlbase/xmlspace/xmllang and no use codes.

Intent to Deprecate and Remove:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/TfwMq4d25hk/C-v_iC_wKfAJ

And remove that don't use codes on SVGElement::parseAttribute(),
Because it is safe as SVGElement::parseAttribute() does nothing
with xml:lang and xml:space.

BUG=485676
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=195291

[hyunjunekim2, 2015-05-08 07:50:35]

hyunjune.kim@samsung.com changed reviewers:
+ fs@opera.com, pdr@chromium.org, philipj@opera.com

[hyunjunekim2, 2015-05-08 07:55:08]

Hi, I'm hyunjunekim (hyunjune.kim@samsung.com, hykim0777@gamil.com).
Could you check this patch? Thank you.

[philipj_slow, 2015-05-08 08:09:25]

Thanks! I've updated the description to point to the blink-dev thread, which
needs 2 more l-g-t-m-s before this can land.

Can you also clean up in the bindings generator? Search for "SVG's
xmlbase/xmlspace/xmllang need special behavior" to find the place.

https://codereview.chromium.org/1137593002/diff/60001/Source/core/svg/SVGElem...
File Source/core/svg/SVGElement.cpp (left):

https://codereview.chromium.org/1137593002/diff/60001/Source/core/svg/SVGElem...
Source/core/svg/SVGElement.cpp:597: } else if (name.matches(XMLNames::langAttr)
|| name.matches(XMLNames::spaceAttr)) {
This isn't really related to removing the IDL attributes, but it is safe as
Element::parseAttribute() does nothing with xml:lang and xml:space. Please
mention this in the commit message.

https://codereview.chromium.org/1137593002/diff/60001/Source/core/svg/SVGElem...
File Source/core/svg/SVGElement.idl (left):

https://codereview.chromium.org/1137593002/diff/60001/Source/core/svg/SVGElem...
Source/core/svg/SVGElement.idl:24: [Reflect, MeasureAs=SVGElementXmlbase]
attribute DOMString xmlbase;
Please also remove the use counters from UseCounter.h

[hyunjunekim2, 2015-05-08 09:17:26]

> Can you also clean up in the bindings generator? Search for "SVG's
> xmlbase/xmlspace/xmllang need special behavior" to find the place.

Ok, I will do it. 
Found like code on code generator.
====================================

# SVG's xmlbase/xmlspace/xmllang need special behavior, i.e.
# it is in XMLNames namespace and the generated attribute has no xml prefix.
if attribute.name.startswith('xml'):
    namespace = 'XMLNames'
    content_attribute_name = content_attribute_name[3:]
else:
    namespace = 'SVGNames'

====================================

[philipj_slow, 2015-05-08 21:20:14]

PS6 LGTM, but please wait for the last LGTM on blink-dev before landing.

[hyunjunekim2, 2015-05-13 01:00:17]

The CQ bit was checked by hyunjune.kim@samsung.com

[commit-bot: I haz the power, 2015-05-13 01:00:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1137593002/100001

[commit-bot: I haz the power, 2015-05-13 03:06:30]

Committed patchset #6 (id:100001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=195291