Objective-C API: wrapperClass holds a static JSClassRef, which causes JSGlobalObjects to leak
https://bugs.webkit.org/show_bug.cgi?id=112856

Reviewed by Geoffrey Garen.

Through a very convoluted path that involves the caching of prototypes on the JSClassRef, we can leak 
JSGlobalObjects when inserting an Objective-C object into multiple independent JSContexts.

* API/JSAPIWrapperObject.cpp: Removed.
* API/JSAPIWrapperObject.h:
(JSAPIWrapperObject):
* API/JSAPIWrapperObject.mm: Copied from Source/JavaScriptCore/API/JSAPIWrapperObject.cpp. Made this an
Objective-C++ file so that we can call release on the wrappedObject. Also added a WeakHandleOwner for 
JSAPIWrapperObjects. This will also be used in a future patch for https://bugs.webkit.org/show_bug.cgi?id=112608.
(JSAPIWrapperObjectHandleOwner):
(jsAPIWrapperObjectHandleOwner):
(JSAPIWrapperObjectHandleOwner::finalize): This finalize replaces the old finalize that was done through
the C API.
(JSC::JSAPIWrapperObject::finishCreation): Allocate the WeakImpl. Balanced in finalize.
(JSC::JSAPIWrapperObject::setWrappedObject): We now do the retain of the wrappedObject here rather than in random
places scattered around JSWrapperMap.mm
* API/JSObjectRef.cpp: Added some ifdefs for platforms that don't support the Obj-C API.
(JSObjectGetPrivate): Ditto.
(JSObjectSetPrivate): Ditto.
(JSObjectGetPrivateProperty): Ditto.
(JSObjectSetPrivateProperty): Ditto.
(JSObjectDeletePrivateProperty): Ditto.
* API/JSValueRef.cpp: Ditto.
(JSValueIsObjectOfClass): Ditto.
* API/JSWrapperMap.mm: Remove wrapperClass().
(objectWithCustomBrand): Change to no longer use a parent class, which was only used to give the ability to 
finalize wrapper objects.
(-[JSObjCClassInfo initWithContext:forClass:superClassInfo:]): Change to no longer use wrapperClass(). 
(-[JSObjCClassInfo allocateConstructorAndPrototypeWithSuperClassInfo:]): Ditto.
(tryUnwrapObjcObject): We now check if the object inherits from JSAPIWrapperObject.
* API/tests/testapi.mm: Added a test that exports an Objective-C object to two different JSContexts and makes 
sure that the first one is collected properly by using a weak JSManagedValue for the wrapper in the first JSContext.
* CMakeLists.txt: Build file modifications.
* GNUmakefile.list.am: Ditto.
* JavaScriptCore.gypi: Ditto.
* JavaScriptCore.vcproj/JavaScriptCore/JavaScriptCore.vcproj: Ditto.
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj: Ditto.
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters: Ditto.
* JavaScriptCore.xcodeproj/project.pbxproj: Ditto.
* runtime/JSGlobalObject.cpp: More ifdefs for unsupported platforms.
(JSC::JSGlobalObject::reset): Ditto.
(JSC::JSGlobalObject::visitChildren): Ditto.
* runtime/JSGlobalObject.h: Ditto.
(JSGlobalObject): Ditto.
(JSC::JSGlobalObject::objcCallbackFunctionStructure): Ditto.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146494 268f45cc-cd09-0410-ab3c-d52691b4dbfc