Use adoptCF and RetainPtr in AXTextMarkerRange::AXTextMarkerRange

https://bugs.webkit.org/show_bug.cgi?id=290248

Reviewed by Geoffrey Garen.

Use adoptCf and RetainPtr instead of manually calling CFRelease.

* Source/WebCore/accessibility/cocoa/AXTextMarkerCocoa.mm:
(WebCore::AXTextMarkerRange::AXTextMarkerRange):

Canonical link: https://commits.webkit.org/292540@main

Author: rniwa

Source/WebCore/accessibility/cocoa/AXTextMarkerCocoa.mm

@@ -131,14 +131,11 @@
         return;
     }
 
-    auto start = AXTextMarkerRangeCopyStartMarker(textMarkerRangeRef);
-    auto end = AXTextMarkerRangeCopyEndMarker(textMarkerRangeRef);
+    RetainPtr start = adoptCF(AXTextMarkerRangeCopyStartMarker(textMarkerRangeRef));
+    RetainPtr end = adoptCF(AXTextMarkerRangeCopyEndMarker(textMarkerRangeRef));
 
-    m_start = start;
-    m_end = end;
-
-    CFRelease(start);
-    CFRelease(end);
+    m_start = start.get();
+    m_end = end.get();
 }
 
 RetainPtr<AXTextMarkerRangeRef> AXTextMarkerRange::platformData() const