https://bugs.webkit.org/show_bug.cgi?id=120230

Reviewed by Darin Adler.

Source/JavaScriptCore:

* API/JSValue.mm:
(valueToString): Don't leak every CFStringRef when in Objective-C GC.
* API/ObjCCallbackFunction.mm:
(JSC::ObjCCallbackFunctionImpl::~ObjCCallbackFunctionImpl): Don't
release m_invocation's target since NSInvocation will do it for us on
-dealloc.
(objCCallbackFunctionForBlock): Tell NSInvocation to retain its target
and -release our reference to the copied block.
* API/tests/minidom.c:
(createStringWithContentsOfFile): Free buffer before returning.
* API/tests/testapi.c:
(createStringWithContentsOfFile): Ditto.

Source/WebCore:

* WebCore.xcodeproj/project.pbxproj: Removed FoundationExtras.h.
* accessibility/mac/WebAccessibilityObjectWrapperMac.mm: Removed CFAutoreleaseHelper().
(AXTextMarkerRange): Used HardAutorelease() instead of
CFAutoreleaseHelper().
(AXTextMarkerRangeStart): Ditto.
(AXTextMarkerRangeEnd): Ditto.
(textMarkerForVisiblePosition...