Clean up creation of "detached" SVG* data type objects

Clean up creation of "detached" SVG* data type objects

Add CreateDetached helpers for the various objects (or, their tear-offs)
that can be created without having a context element. This is in
preparation for replacing some of these with their DOM* counterparts
from the Geometry specifications [1]. The "detached" term is borrowed from
the SVG2 specification [2].
Also drop all of the default arguments that pass QualifiedName::Null(),
and instead explicitly pass them where needed (for detached objects.)

[1] https://drafts.fxtf.org/geometry/
[2] https://svgwg.org/svg2-draft/struct.html#__svg__SVGSVGElement__createSVGNumber

BUG=709001
Review-Url: https://codereview.chromium.org/2912663002
Cr-Commit-Position: refs/heads/master@{#475583}
Committed: https://chromium.googlesource.com/chromium/src/+/99b481419897f642644932ecab1db0ee7453147e

[fs, 2017-05-28 21:53:02]

The CQ bit was checked by fs@opera.com to run a CQ dry run

[commit-bot: I haz the power, 2017-05-28 21:53:08]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-05-29 00:02:34]

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

[commit-bot: I haz the power, 2017-05-29 00:02:35]

Dry run: This issue passed the CQ dry run.

[fs, 2017-05-29 18:11:05]

Description was changed from

==========
Clean up creation of "detached" SVG* objects
==========

to

==========
Clean up creation of "detached" SVG* data type objects

Add CreateDetached helpers for the various objects (or, their tear-offs)
that can be created without having a context element. This is in
preparation for replacing some of these with their DOM* counterparts
from the Geometry specifications [1]. The "detached" term is borrowed from
the SVG2 specification [2].
Also drop all of the default arguments that pass QualifiedName::Null(),
and instead explicitly pass them where needed (for detached objects.)

[1] https://drafts.fxtf.org/geometry/
[2]
https://svgwg.org/svg2-draft/struct.html#__svg__SVGSVGElement__createSVGNumber

BUG=709001
==========

[fs, 2017-05-29 18:11:22]

fs@opera.com changed reviewers:
+ schenney@chromium.org

[Stephen Chennney, 2017-05-30 15:24:04]

lgtm

[fs, 2017-05-30 15:26:20]

The CQ bit was checked by fs@opera.com

[commit-bot: I haz the power, 2017-05-30 15:26:43]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-05-30 17:42:22]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1496157980188560, "parent_rev":
"f23174882c11f77a5b58cf37ab4051a2ad68a4bf", "commit_rev":
"99b481419897f642644932ecab1db0ee7453147e"}

[commit-bot: I haz the power, 2017-05-30 17:42:35]

Description was changed from

==========
Clean up creation of "detached" SVG* data type objects

Add CreateDetached helpers for the various objects (or, their tear-offs)
that can be created without having a context element. This is in
preparation for replacing some of these with their DOM* counterparts
from the Geometry specifications [1]. The "detached" term is borrowed from
the SVG2 specification [2].
Also drop all of the default arguments that pass QualifiedName::Null(),
and instead explicitly pass them where needed (for detached objects.)

[1] https://drafts.fxtf.org/geometry/
[2]
https://svgwg.org/svg2-draft/struct.html#__svg__SVGSVGElement__createSVGNumber

BUG=709001
==========

to

==========
Clean up creation of "detached" SVG* data type objects

Add CreateDetached helpers for the various objects (or, their tear-offs)
that can be created without having a context element. This is in
preparation for replacing some of these with their DOM* counterparts
from the Geometry specifications [1]. The "detached" term is borrowed from
the SVG2 specification [2].
Also drop all of the default arguments that pass QualifiedName::Null(),
and instead explicitly pass them where needed (for detached objects.)

[1] https://drafts.fxtf.org/geometry/
[2]
https://svgwg.org/svg2-draft/struct.html#__svg__SVGSVGElement__createSVGNumber

BUG=709001

Review-Url: https://codereview.chromium.org/2912663002
Cr-Commit-Position: refs/heads/master@{#475583}
Committed:
https://chromium.googlesource.com/chromium/src/+/99b481419897f642644932ecab1d...
==========

[commit-bot: I haz the power, 2017-05-30 17:42:37]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/99b481419897f642644932ecab1d...