Approved by Maciej, Darin.

    Approved by Maciej, Darin.

        Renamed JSStringBufferRef to JSInternalStringRef. "Internal string" means the
        JavaScript engine's internal string representation, which is the most
        low-level and efficient representation to use when interfacing with JavaScript.

        * API/APICast.h:
        (toJS):
        (toRef):
        * API/JSBase.h:
        * API/JSCallbackObject.cpp:
        (KJS::JSCallbackObject::getOwnPropertySlot):
        (KJS::JSCallbackObject::put):
        (KJS::JSCallbackObject::deleteProperty):
        (KJS::JSCallbackObject::staticValueGetter):
        (KJS::JSCallbackObject::callbackGetter):
        * API/JSContextRef.cpp:
        (JSEvaluate):
        (JSCheckSyntax):
        * API/JSContextRef.h:
        * API/JSInternalStringRef.cpp: Added.
        (JSStringMake):
        (JSInternalStringCreate):
        (JSInternalStringCreateUTF8):
        (JSInternalStringRetain):
        (JSInternalStringRelease):
        (JSValueCopyStringValue):
        (JSInternalStringGetLength):
        (JSInternalStringGetCharactersPtr):
        (JSInternalStringGetCharacters):
        (JSInternalStringGetMaxLengthUTF8):
        (JSInternalStringGetCharactersUTF8):
        (JSInternalStringIsEqual):
        (JSInternalStringIsEqualUTF8):
        (JSInternalStringCreateCF):
        (CFStringCreateWithJSInternalString):
        * API/JSInternalStringRef.h: Added.
        * API/JSNode.c:
        (JSNodePrototype_appendChild):
        (JSNode_getNodeType):
        (JSNode_getChildNodes):
        (JSNode_getFirstChild):
        * API/JSNodeList.c:
        (JSNodeList_length):
        (JSNodeList_getProperty):
        * API/JSObjectRef.cpp:
        (JSFunctionMakeWithBody):
        (JSObjectGetDescription):
        (JSObjectHasProperty):
        (JSObjectGetProperty):
        (JSObjectSetProperty):
        (JSObjectDeleteProperty):
        (JSPropertyEnumeratorGetNext):
        (JSPropertyListAdd):
        * API/JSObjectRef.h:
        * API/JSStringBufferRef.cpp: Removed.
        * API/JSStringBufferRef.h: Removed.
        * API/JSValueRef.h:
        * API/JavaScriptCore.h:
        * API/minidom.c:
        (main):
        (print):
        * API/testapi.c:
        (assertEqualsAsUTF8String):
        (assertEqualsAsCharactersPtr):
        (assertEqualsAsCharacters):
        (MyObject_hasProperty):
        (MyObject_getProperty):
        (MyObject_setProperty):
        (MyObject_deleteProperty):
        (MyObject_getPropertyList):
        (print_callAsFunction):
        (myConstructor_callAsConstructor):
        (main):
        * JavaScriptCore.exp:
        * JavaScriptCore.xcodeproj/project.pbxproj:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@15307 268f45cc-cd09-0410-ab3c-d52691b4dbfc