Revert of [Oilpan] Move MediaStream{Source|Component|Descriptor} to Oilpan heap

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

Index: third_party/WebKit/Source/platform/mediastream/MediaStreamComponent.cpp
diff --git a/third_party/WebKit/Source/platform/mediastream/MediaStreamComponent.cpp b/third_party/WebKit/Source/platform/mediastream/MediaStreamComponent.cpp
index b6d59cdf37a07a14bbc42a2b56bbeb2fa8c419ab..8e6721cb71c1418808110181eee19544f0b79706 100644
--- a/third_party/WebKit/Source/platform/mediastream/MediaStreamComponent.cpp
+++ b/third_party/WebKit/Source/platform/mediastream/MediaStreamComponent.cpp
@@ -39,17 +39,17 @@
 
 namespace blink {
 
-MediaStreamComponent* MediaStreamComponent::create(MediaStreamSource* source)
+PassRefPtr<MediaStreamComponent> MediaStreamComponent::create(PassRefPtr<MediaStreamSource> source)
 {
-    return new MediaStreamComponent(createCanonicalUUIDString(), source);
+    return adoptRef(new MediaStreamComponent(createCanonicalUUIDString(), source));
 }
 
-MediaStreamComponent* MediaStreamComponent::create(const String& id, MediaStreamSource* source)
+PassRefPtr<MediaStreamComponent> MediaStreamComponent::create(const String& id, PassRefPtr<MediaStreamSource> source)
 {
-    return new MediaStreamComponent(id, source);
+    return adoptRef(new MediaStreamComponent(id, source));
 }
 
-MediaStreamComponent::MediaStreamComponent(const String& id, MediaStreamSource* source)
+MediaStreamComponent::MediaStreamComponent(const String& id, PassRefPtr<MediaStreamSource> source)
     : m_source(source)
     , m_id(id)
     , m_enabled(true)
@@ -87,9 +87,5 @@
 }
 #endif // #if ENABLE(WEB_AUDIO)
 
-DEFINE_TRACE(MediaStreamComponent)
-{
-    visitor->trace(m_source);
-}
+} // namespace blink
 
-} // namespace blink