Fixed <rdar://problem/5064964> Repro ASSERT failure in JS Bindings when 
        closing window @ lowtrades.bptrade.com
        
        Unfortunately, the bindings depend on UString and Identifier as string 
        representations. So, they need to acquire the JSLock when doing something
        that will ref/deref their strings.

        Layout tests, the original site, and Java, Flash, and Quicktime on the 
        web work. No leaks reported. No automated test for this because testing 
        the Java bindings, like math, is hard.
        
        * bindings/runtime.h: Made Noncopyable, just to be sure.
        
        * bindings/c/c_class.cpp: 
        (KJS::Bindings::CClass::~CClass): Acquire the JSLock and explicitly clear the keys
        in our hashtable, since they're UString::Reps, and ref/deref aren't thread-safe.
        (KJS::Bindings::CClass::methodsNamed): Also acquire the JSLock when adding
        keys to the table, since the table ref's them.
        (KJS::Bindings::CClass::fieldNamed): ditto.

        * bindings/c/c_utility.cpp: Removed dead function.
        (KJS::Bindings::convertValueToNPVariant): Acquire the JSLock because doing
        it recursively is pretty cheap, and it's just too confusing to tell whether
        all our callers do it for us.
        (KJS::Bindings::convertNPVariantToValue): ditto
        * bindings/c/c_utility.h:

        * bindings/jni/jni_class.cpp: Same deal as c_class.cpp.
        (JavaClass::JavaClass):
        (JavaClass::~JavaClass):

        * bindings/jni/jni_instance.cpp: Same deal as c_utility.cpp.
        (JavaInstance::stringValue):
        * bindings/jni/jni_jsobject.cpp:
        (JavaJSObject::convertValueToJObject):

        * bindings/jni/jni_runtime.cpp:
        (JavaMethod::~JavaMethod): Moved from header, for clarity.
        (appendClassName): Made this static, so the set of callers is known, and
        we can assert that we hold the JSLock. Also changed it to take a UString
        reference, which makes the calling code simpler.
        (JavaMethod::signature): Store the ASCII value we care about instead of
        a UString, since UString is so much more hassle. Hold the JSLock while
        building up the temporary UString.

        * bindings/jni/jni_runtime.h: Nixed dead code in JavaMethod.
        (KJS::Bindings::JavaString::JavaString): Hold a UString::Rep instead of
        a UString, so we can acquire the JSLock and explicitly release it.
        (KJS::Bindings::JavaString::_commonInit):
        (KJS::Bindings::JavaString::~JavaString):
        (KJS::Bindings::JavaString::UTF8String):
        (KJS::Bindings::JavaString::uchars):
        (KJS::Bindings::JavaString::length):
        (KJS::Bindings::JavaString::ustring):

        * bindings/jni/jni_utility.cpp:
        (KJS::Bindings::convertArrayInstanceToJavaArray): Made this static, so 
        the set of callers is known, and we can assert that we hold the JSLock. 
        (KJS::Bindings::convertValueToJValue): Acquire the JSLock because doing
        it recursively is pretty cheap, and it's just too confusing to tell whether
        all our callers do it for us.

        * bindings/objc/objc_runtime.h: Nixed some dead code.
        * bindings/objc/objc_utility.mm:
        (KJS::Bindings::convertNSStringToString): Same drill as above.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@20292 268f45cc-cd09-0410-ab3c-d52691b4dbfc