Oilpan: Remove GC_INFO_{DEFINE,DECLARE} macros

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 64e8021bd5204ef9799a3085f9a849c9b44815d9..3f9bbf97b7ac9d4c9188c45eccb459d9880f1c03 100644
--- a/Source/modules/mediasource/SourceBuffer.cpp
+++ b/Source/modules/mediasource/SourceBuffer.cpp
@@ -72,8 +72,6 @@ static bool throwExceptionIfRemovedOrUpdating(bool isRemoved, bool isUpdating, E
 
 } // namespace
 
-DEFINE_GC_INFO(SourceBuffer);
-
 PassRefPtrWillBeRawPtr<SourceBuffer> SourceBuffer::create(PassOwnPtr<WebSourceBuffer> webSourceBuffer, MediaSource* source, GenericEventQueue* asyncEventQueue)
 {
     RefPtrWillBeRawPtr<SourceBuffer> sourceBuffer(adoptRefCountedWillBeRefCountedGarbageCollected(new SourceBuffer(webSourceBuffer, source, asyncEventQueue)));