Reviewed by Sam.

    Reviewed by Sam.

        * WebCore.xcodeproj/project.pbxproj:
        Change jni_jsobject.cpp to be Obj-C++ for now. The plan is to merge
        this with jni_objc.mm and create jni_jsobject.mm.

        * bridge/jni/jni_jsobject.cpp:
        (createRootObject):
        Move createRootObject here from WebCoreFrameBridge.

        (JavaJSObject::createNative):
        Call the newly added createRootObject function.

        * bridge/runtime_root.cpp:
        (KJS::Bindings::RootObject::initializeJNIThreading):
        * bridge/runtime_root.h:
        setCreateRootObject no longer takes a root object, rename it to initializeJNIThreading.

        * page/mac/FrameMac.mm:
        (WebCore::Frame::createScriptInstanceForWidget):
        Just call Frame::createRootObject here.

        * page/mac/WebCoreFrameBridge.mm:
        (-[WebCoreFrameBridge init]):
        Call initializeJNIThreading.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@30814 268f45cc-cd09-0410-ab3c-d52691b4dbfc