Fix MSE GC, make it less aggressive, more spec-compliant (Blink CL)

Source/modules/mediasource/MediaSource.cpp

Index: Source/modules/mediasource/MediaSource.cpp
diff --git a/Source/modules/mediasource/MediaSource.cpp b/Source/modules/mediasource/MediaSource.cpp
index 6e283691077fffaa96d1219a57c214751962732f..81406a79bb086f030e062de435269b01d678c1d3 100644
--- a/Source/modules/mediasource/MediaSource.cpp
+++ b/Source/modules/mediasource/MediaSource.cpp
@@ -517,6 +517,11 @@ void MediaSource::setSourceBufferActive(SourceBuffer* sourceBuffer)
     m_activeSourceBuffers->insert(insertPosition, sourceBuffer);
 }
 
+HTMLMediaElement* MediaSource::mediaElement() const
+{
+    return m_attachedElement;

[philipj_slow, 2015/07/08 12:47:44]

The getters inlined in the header have .get(), can you check if this change will
build with Oilpan without it?

[servolk, 2015/07/08 19:03:47]

You are right. Changed to .get() for consistency with other getters.

+}
+
 bool MediaSource::isClosed() const
 {
     return readyState() == closedKeyword();