Get rid of ThreadRestrictionVerifier

https://bugs.webkit.org/show_bug.cgi?id=127004

Reviewed by Sam Weinig.

Source/WebCore:

Remove now unneeded calls.

* loader/icon/IconDatabase.cpp:
(WebCore::IconDatabase::defaultIcon):
(WebCore::IconDatabase::setIconDataForIconURL):
(WebCore::IconDatabase::getOrCreateIconRecord):
(WebCore::IconDatabase::readFromDatabase):

Source/WTF:

The ThreadRestrictionVerifier mechanism has been turned off for a while
since it doesn't really have a good solution for objects that are passed between threads.
Instead of having dead code in the tree, just get rid of it.

* GNUmakefile.list.am:
* WTF.vcxproj/WTF.vcxproj:
* WTF.vcxproj/WTF.vcxproj.filters:
* WTF.xcodeproj/project.pbxproj:
* wtf/CMakeLists.txt:
* wtf/RefCounted.h:
(WTF::RefCountedBase::ref):
(WTF::RefCountedBase::hasOneRef):
(WTF::RefCountedBase::refCount):
(WTF::RefCountedBase::derefBase):
* wtf/ThreadRestrictionVerifier.h: Removed.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@161999 268f45cc-cd09-0410-ab3c-d52691b4dbfc