Revert 124780 - Create a MediaSource object.

Source/WebCore/DerivedSources.make

 # Copyright (C) 2006, 2007, 2008, 2012 Apple Inc. All rights reserved.
 # Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
 # Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 #
 # 1.  Redistributions of source code must retain the above copyright
 #     notice, this list of conditions and the following disclaimer.
@@ skipping 88 matching lines @@
     $(WebCore)/Modules/indexeddb/IDBFactory.idl \
     $(WebCore)/Modules/indexeddb/IDBIndex.idl \
     $(WebCore)/Modules/indexeddb/IDBKey.idl \
     $(WebCore)/Modules/indexeddb/IDBKeyRange.idl \
     $(WebCore)/Modules/indexeddb/IDBObjectStore.idl \
     $(WebCore)/Modules/indexeddb/IDBRequest.idl \
     $(WebCore)/Modules/indexeddb/IDBTransaction.idl \
     $(WebCore)/Modules/indexeddb/IDBVersionChangeEvent.idl \
     $(WebCore)/Modules/indexeddb/IDBVersionChangeRequest.idl \
     $(WebCore)/Modules/indexeddb/WorkerContextIndexedDatabase.idl \
-    $(WebCore)/Modules/mediasource/MediaSource.idl \
     $(WebCore)/Modules/mediasource/SourceBuffer.idl \
     $(WebCore)/Modules/mediasource/SourceBufferList.idl \
     $(WebCore)/Modules/notifications/DOMWindowNotifications.idl \
     $(WebCore)/Modules/notifications/Notification.idl \
     $(WebCore)/Modules/notifications/NotificationCenter.idl \
     $(WebCore)/Modules/notifications/NotificationPermissionCallback.idl \
     $(WebCore)/Modules/notifications/WorkerContextNotifications.idl \
     $(WebCore)/Modules/quota/DOMWindowQuota.idl \
     $(WebCore)/Modules/quota/StorageInfo.idl \
     $(WebCore)/Modules/quota/StorageInfoErrorCallback.idl \
@@ skipping 958 matching lines @@
 # Header detection
 
 ifeq ($(OS),Windows_NT)
 
 all : WebCoreHeaderDetection.h
 
 WebCoreHeaderDetection.h : DerivedSources.make
         if [ -f "$(WEBKITLIBRARIESDIR)/include/AVFoundationCF/AVCFBase.h" ]; then echo "#define HAVE_AVCF 1" > $@; else echo > $@; fi
 
 endif # Windows_NT