Always enable Oilpan for EventSource.

Source/modules/mediasource/SourceBuffer.cpp

Index: Source/modules/mediasource/SourceBuffer.cpp
diff --git a/Source/modules/mediasource/SourceBuffer.cpp b/Source/modules/mediasource/SourceBuffer.cpp
index ceea5a8db2bc65ba31173ef4588b53b514fd3e84..f7138e6fec0b2c28be83f30fc040cbbea116a3ff 100644
--- a/Source/modules/mediasource/SourceBuffer.cpp
+++ b/Source/modules/mediasource/SourceBuffer.cpp
@@ -662,7 +662,7 @@ void SourceBuffer::appendStreamInternal(Stream* stream, ExceptionState& exceptio
     // 4. Asynchronously run the stream append loop algorithm with stream and maxSize.
 
     stream->neuter();
-    m_loader = adoptPtr(new FileReaderLoader(FileReaderLoader::ReadByClient, this));
+    m_loader = FileReaderLoader::create(FileReaderLoader::ReadByClient, this);
     m_stream = stream;
     m_appendStreamAsyncPartRunner.runAsync();
 }