Rename 'ScalarValueString' to 'USVString' to match Web IDL

Rename 'ScalarValueString' to 'USVString' to match Web IDL

Originally proposed in the Encoding standard as 'ScalarValueString',
this type was finally added to Web IDL with the name 'USVString'
("Unicode scalar value string"). The behavior is identical: unpaired
UTF-16 surrogate code units in JS strings are converted to U+FFFD
replacement characters by the binding layer.

The type name is not exposed to script, so this is not a web-exposed
change.

Spec: http://heycam.github.io/webidl/#idl-USVString

BUG=423660
R=haraken@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184312

[jsbell, 2014-10-23 18:55:31]

haraken@ - PTAL?

Purely mechanical rename of 'ScalarValueString' -> 'USVString' and
'scalarValueString' -> 'usvString', plus a few comment tweaks.

[sof, 2014-10-23 21:52:25]

sigbjornf@opera.com changed reviewers:
+ sigbjornf@opera.com

[sof, 2014-10-23 21:52:25]

lgtm

[jsbell, 2014-10-23 22:53:47]

The CQ bit was checked by jsbell@chromium.org

[commit-bot: I haz the power, 2014-10-23 22:54:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/644473006/1

[commit-bot: I haz the power, 2014-10-23 23:07:44]

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

[commit-bot: I haz the power, 2014-10-23 23:07:47]

Try jobs failed on following builders:
  blink_presubmit on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/blink_presubmit/builds/1...)

[jsbell, 2014-10-23 23:17:44]

On 2014/10/23 23:07:47, I haz the power (commit-bot) wrote:
> Try jobs failed on following builders:
>   blink_presubmit on tryserver.blink
>
(http://build.chromium.org/p/tryserver.blink/builders/blink_presubmit/builds/1...)

Oh, right - touches core etc. :P

(On my phone at the moment, but if any top level owners feel like an RS+CQ I'd
be grateful.)

[haraken, 2014-10-23 23:29:53]

LGTM

[bashi, 2014-10-23 23:31:27]

The CQ bit was checked by bashi@chromium.org

[commit-bot: I haz the power, 2014-10-23 23:32:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/644473006/1

[commit-bot: I haz the power, 2014-10-23 23:39:39]

Committed patchset #1 (id:1) as 184312