Oilpan: have the media element safely close its MediaSource.

Source/modules/mediasource/SourceBuffer.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 87 matching lines @@
     , m_streamMaxSize(0)
     , m_appendStreamAsyncPartRunner(this, &SourceBuffer::appendStreamAsyncPart)
 {
     ASSERT(m_webSourceBuffer);
     ASSERT(m_source);
     ScriptWrappable::init(this);
 }
 
 SourceBuffer::~SourceBuffer()
 {
+    // Oilpan: a SourceBuffer might be finalized without having been
+    // explicitly removed first, hence the asserts below will not
+    // hold.
+#if !ENABLE(OILPAN)
     ASSERT(isRemoved());
     ASSERT(!m_loader);
     ASSERT(!m_stream);
+#endif
 }
 
 const AtomicString& SourceBuffer::segmentsKeyword()
 {
     DEFINE_STATIC_LOCAL(const AtomicString, segments, ("segments", AtomicString::ConstructFromLiteral));
     return segments;
 }
 
 const AtomicString& SourceBuffer::sequenceKeyword()
 {
@@ skipping 589 matching lines @@
 }
 
 void SourceBuffer::trace(Visitor* visitor)
 {
     visitor->trace(m_source);
     visitor->trace(m_stream);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace WebCore