https://bugs.webkit.org/show_bug.cgi?id=91948

Reviewed by Geoffrey Garen.

Moving GregorianDateTime into the WTF namespace allows us to us to
use it in WebCore too. The new class has the same behaviour as the
old struct. Only the unused timeZone member has been removed.

Source/JavaScriptCore:

* runtime/DateConstructor.cpp:
* runtime/DateConversion.cpp:
* runtime/DateConversion.h:
* runtime/DateInstance.h:
* runtime/DatePrototype.cpp:
* runtime/JSDateMath.cpp:
* runtime/JSDateMath.h:

Source/WebCore:

* bridge/qt/qt_runtime.cpp:
(JSC::Bindings::convertValueToQVariant):
(JSC::Bindings::convertQVariantToValue):
* bridge/qt/qt_runtime_qt4.cpp:
(JSC::Bindings::convertValueToQVariant):
(JSC::Bindings::convertQVariantToValue):

Source/WTF:

* GNUmakefile.list.am:
* WTF.gypi:
* WTF.pro:
* WTF.vcproj/WTF.vcproj:
* WTF.xcodeproj/project.pbxproj:
* wtf/CMakeLists.txt:
* wtf/GregorianDateTime.h: Added.
(GregorianDateTime):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@123425 268f45cc-cd09-0410-ab3c-d52691b4dbfc