Fixed <rdar://problem/3887930> Must use new Java plug-in API to get/set fields so...

	Fixed <rdar://problem/3887930> Must use new Java plug-in API to get/set fields so exception handling works (fixes many LiveConnect crashes)

	Use the new dispatching API to invoke JNI, rather than calling JNI
	directly.

        Reviewed by David Harrison.

        * bindings/jni/jni_instance.cpp:
        (JavaInstance::invokeMethod):
        * bindings/jni/jni_runtime.cpp:
        (JavaField::dispatchValueFromInstance):
        (JavaField::valueFromInstance):
        (JavaField::dispatchSetValueToInstance):
        (JavaField::setValueToInstance):
        * bindings/jni/jni_runtime.h:
        * bindings/jni/jni_utility.cpp:
        (KJS::Bindings::convertValueToJValue):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8344 268f45cc-cd09-0410-ab3c-d52691b4dbfc