Use LazyNeverDestroyed instead of DEFINE_GLOBAL for MediaFeatureNames

Use LazyNeverDestroyed instead of DEFINE_GLOBAL for MediaFeatureNames
https://bugs.webkit.org/show_bug.cgi?id=175008

Patch by Fujii Hironori <Hironori.Fujii@sony.com> on 2017-07-31
Reviewed by Alex Christensen.

No new tests because no behavior change.

Stop using DEFINE_GLOBAL hack in favor of LazyNeverDestroyed.

* css/MediaFeatureNames.cpp:
(WebCore::MediaFeatureNames::init): Do not include
<wtf/StaticConstructors.h>. Use LazyNeverDestroyed instead of
DEFINE_GLOBAL. Call LazyNeverDestroyed::construct instead of
placement new.
* css/MediaFeatureNames.h: Use LazyNeverDestroyed.
* css/MediaQueryEvaluator.cpp:
(WebCore::MediaQueryEvaluator::evaluate const): Dereference with ->.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@220090 268f45cc-cd09-0410-ab3c-d52691b4dbfc