Reland: [Oilpan] Move MediaStream{Source|Component|Descriptor} to Oilpan heap

third_party/WebKit/Source/platform/mediastream/MediaStreamSource.cpp

Index: third_party/WebKit/Source/platform/mediastream/MediaStreamSource.cpp
diff --git a/third_party/WebKit/Source/platform/mediastream/MediaStreamSource.cpp b/third_party/WebKit/Source/platform/mediastream/MediaStreamSource.cpp
index f03a996183f450ece8d3b3a900a4892afde9c4bf..2da75e51ed9b84a5ad0849d0e796c26d4a9ed71c 100644
--- a/third_party/WebKit/Source/platform/mediastream/MediaStreamSource.cpp
+++ b/third_party/WebKit/Source/platform/mediastream/MediaStreamSource.cpp
@@ -34,9 +34,9 @@
 
 namespace blink {
 
-PassRefPtr<MediaStreamSource> MediaStreamSource::create(const String& id, Type type, const String& name, bool remote, bool readonly, ReadyState readyState, bool requiresConsumer)
+MediaStreamSource* MediaStreamSource::create(const String& id, Type type, const String& name, bool remote, bool readonly, ReadyState readyState, bool requiresConsumer)
 {
-    return adoptRef(new MediaStreamSource(id, type, name, remote, readonly, readyState, requiresConsumer));
+    return new MediaStreamSource(id, type, name, remote, readonly, readyState, requiresConsumer);
 }
 
 MediaStreamSource::MediaStreamSource(const String& id, Type type, const String& name, bool remote, bool readonly, ReadyState readyState, bool requiresConsumer)
@@ -54,21 +54,14 @@ void MediaStreamSource::setReadyState(ReadyState readyState)
 {
     if (m_readyState != ReadyStateEnded && m_readyState != readyState) {
         m_readyState = readyState;
-        for (Vector<Observer*>::iterator i = m_observers.begin(); i != m_observers.end(); ++i)
+        for (auto i = m_observers.begin(); i != m_observers.end(); ++i)
             (*i)->sourceChangedState();
     }
 }
 
 void MediaStreamSource::addObserver(MediaStreamSource::Observer* observer)
 {
-    m_observers.append(observer);
-}
-
-void MediaStreamSource::removeObserver(MediaStreamSource::Observer* observer)
-{
-    size_t pos = m_observers.find(observer);
-    if (pos != kNotFound)
-        m_observers.remove(pos);
+    m_observers.add(observer);
 }
 
 void MediaStreamSource::addAudioConsumer(AudioDestinationConsumer* consumer)
@@ -105,4 +98,10 @@ void MediaStreamSource::consumeAudio(AudioBus* bus, size_t numberOfFrames)
         (*it)->consumeAudio(bus, numberOfFrames);
 }
 
+DEFINE_TRACE(MediaStreamSource)
+{
+    visitor->trace(m_observers);
+    visitor->trace(m_audioConsumers);
+}
+
 } // namespace blink