Reviewed by Oliver Hunt, Darin Adler.

JSC::UStringImpl and WebCore::StringImpl (soon to be renamed to
WTF::StringImpl) are almost identical.  Remove duplication of code by unifying
the two, move missing features from UStringImpl into StringImpl & delete the
class UStringImpl.

* API/JSClassRef.cpp:
* API/JSContextRef.cpp:
* GNUmakefile.am:
* JavaScriptCore.exp:
* JavaScriptCore.pro:
* JavaScriptCore.xcodeproj/project.pbxproj:
* bytecode/EvalCodeCache.h:
* bytecode/JumpTable.cpp:
* profiler/ProfileNode.cpp:
* runtime/Identifier.cpp:
(JSC::Identifier::add):
* runtime/Identifier.h:
(JSC::Identifier::equal):
* runtime/UString.cpp:
* runtime/UString.h:
(WTF::):
* runtime/UStringImpl.cpp: Removed.
* runtime/UStringImpl.h:
* wtf/text/StringHash.h:
(WebCore::StringHash::equal):
(WebCore::CaseFoldingHash::equal):
* wtf/text/StringImpl.cpp:
(WebCore::StringImpl::~StringImpl):
(WebCore::StringImpl::empty):
(WebCore::StringImpl::sharedBuffer):
(WebCore::equal):
* wtf/text/StringImpl.h:
(WebCore::StringImpl::StringImpl):
(WebCore::StringImpl::create):
(WebCore::StringImpl::tryCreateUninitialized):
(WebCore::StringImpl::cost):
(WebCore::StringImpl::isIdentifier):
(WebCore::StringImpl::setIsIdentifier):
(WebCore::StringImpl::computeHash):
(WebCore::StringImpl::copyChars):
(WebCore::StringImpl::):

JavaScriptGlue: Bug 37906 - Remove JSC::UStringImpl; unify with StringImpl.
Add forwarding header.

Reviewed by Oliver Hunt, Darin Adler.

* ForwardingHeaders/wtf/ASCIICType.h: Added.
* ForwardingHeaders/wtf/text/StringImpl.h: Added.

WebCore: Bug 37906 - Remove JSC::UStringImpl; unify with StringImpl.
Add include for StringHash.h.

Reviewed by Oliver Hunt, Darin Adler.

* WebCore.xcodeproj/project.pbxproj:
* bridge/c/c_class.cpp:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@58001 268f45cc-cd09-0410-ab3c-d52691b4dbfc