Cherry-pick 261817@main (52c77ee). https://bugs.webkit.org/show_bug.c…

…gi?id=254045

    Fix smart pointer usage when dealing with ScriptExecutionContext
    https://bugs.webkit.org/show_bug.cgi?id=254045
    rdar://106721110

    Reviewed by Ryosuke Niwa.

    This change fixes uses of ScriptExecutionContext so that it conforms
    with the smart pointer usage guidelines.

    * Source/WebCore/Modules/speech/SpeechSynthesisUtterance.h:

    Canonical link: https://commits.webkit.org/261817@main

Source/WebCore/Modules/speech/SpeechSynthesisUtterance.h

@@ -30,6 +30,7 @@
 #include "ContextDestructionObserver.h"
 #include "EventTarget.h"
 #include "PlatformSpeechSynthesisUtterance.h"
+#include "ScriptExecutionContext.h"
 #include "SpeechSynthesisErrorCode.h"
 #include "SpeechSynthesisVoice.h"
 #include <wtf/RefCounted.h>
@@ -80,14 +81,14 @@ class WEBCORE_EXPORT SpeechSynthesisUtterance final : public PlatformSpeechSynth
 private:
     SpeechSynthesisUtterance(ScriptExecutionContext&, const String&, UtteranceCompletionHandler&&);
 
-    ScriptExecutionContext* scriptExecutionContext() const final { return &m_scriptExecutionContext; }
+    ScriptExecutionContext* scriptExecutionContext() const final { return m_scriptExecutionContext.get(); }
     EventTargetInterface eventTargetInterface() const final { return SpeechSynthesisUtteranceEventTargetInterfaceType; }
     void refEventTarget() final { ref(); }
     void derefEventTarget() final { deref(); }
 
     RefPtr<PlatformSpeechSynthesisUtterance> m_platformUtterance;
     RefPtr<SpeechSynthesisVoice> m_voice;
-    ScriptExecutionContext& m_scriptExecutionContext;
+    WeakPtr<ScriptExecutionContext> m_scriptExecutionContext;
     UtteranceCompletionHandler m_completionHandler;
 };