Now WTF::String can do everything that JSC::UString can do!

Rubber stamped by Sam Weinig.

* JavaScriptCore.exp:
* bytecode/CodeBlock.cpp:
(JSC::escapeQuotes):
* bytecompiler/NodesCodegen.cpp:
(JSC::substitute):
* parser/SourceProvider.h:
(JSC::UStringSourceProvider::getRange):
* runtime/FunctionPrototype.cpp:
(JSC::insertSemicolonIfNeeded):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::parseInt):
* runtime/JSONObject.cpp:
(JSC::gap):
(JSC::Stringifier::indent):
(JSC::Stringifier::unindent):
* runtime/JSString.cpp:
(JSC::JSString::replaceCharacter):
* runtime/NumberPrototype.cpp:
(JSC::numberProtoFuncToFixed):
(JSC::numberProtoFuncToPrecision):
* runtime/StringPrototype.cpp:
(JSC::stringProtoFuncReplace):
(JSC::trimString):
* runtime/UString.cpp:
(JSC::UString::substringSharingImpl):
* runtime/UString.h:
* wtf/text/WTFString.cpp:
(WTF::String::substringSharingImpl):
* wtf/text/WTFString.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@65593 268f45cc-cd09-0410-ab3c-d52691b4dbfc