Move PlatformSpeechSynthesisVoice off the heap.

third_party/WebKit/Source/modules/speech/SpeechSynthesis.cpp

 /*
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 49 matching lines @@
     if (executionContext() && !executionContext()->activeDOMObjectsAreStopped())
         dispatchEvent(Event::create(EventTypeNames::voiceschanged));
 }
 
 const HeapVector<Member<SpeechSynthesisVoice>>& SpeechSynthesis::getVoices()
 {
     if (m_voiceList.size())
         return m_voiceList;
 
     // If the voiceList is empty, that's the cue to get the voices from the platform again.
-    const HeapVector<Member<PlatformSpeechSynthesisVoice>>& platformVoices = m_platformSpeechSynthesizer->voiceList();
+    const Vector<RefPtr<PlatformSpeechSynthesisVoice>>& platformVoices = m_platformSpeechSynthesizer->voiceList();
     size_t voiceCount = platformVoices.size();
     for (size_t k = 0; k < voiceCount; k++)
         m_voiceList.append(SpeechSynthesisVoice::create(platformVoices[k]));
 
     return m_voiceList;
 }
 
 bool SpeechSynthesis::speaking() const
 {
     // If we have a current speech utterance, then that means we're assumed to be in a speaking state.
@@ skipping 151 matching lines @@
 {
     visitor->trace(m_platformSpeechSynthesizer);
     visitor->trace(m_voiceList);
     visitor->trace(m_utteranceQueue);
     PlatformSpeechSynthesizerClient::trace(visitor);
     RefCountedGarbageCollectedEventTargetWithInlineData<SpeechSynthesis>::trace(visitor);
     ContextLifecycleObserver::trace(visitor);
 }
 
 } // namespace blink