Revert 124780 - Create a MediaSource object.

Source/WebCore/WebCore.gypi

 {
     'variables': {
         'project_dir': ['.'],
         # These headers are part of WebCore's private API in the Apple Mac build.
         'webcore_privateheader_files': [
             'Modules/geolocation/Geolocation.h',
             'Modules/geolocation/GeolocationController.h',
             'Modules/geolocation/GeolocationError.h',
             'Modules/geolocation/GeolocationPosition.h',
             'Modules/geolocation/Geoposition.h',
@@ skipping 811 matching lines @@
             'Modules/indexeddb/IDBRequest.idl',
             'Modules/indexeddb/IDBTransaction.idl',
             'Modules/indexeddb/IDBVersionChangeEvent.idl',
             'Modules/indexeddb/IDBVersionChangeRequest.idl',
             'Modules/indexeddb/WorkerContextIndexedDatabase.idl',
             'Modules/intents/DeliveredIntent.idl',
             'Modules/intents/DOMWindowIntents.idl',
             'Modules/intents/Intent.idl',
             'Modules/intents/IntentResultCallback.idl',
             'Modules/intents/NavigatorIntents.idl',
-            'Modules/mediasource/MediaSource.idl',
             'Modules/mediasource/SourceBuffer.idl',
             'Modules/mediasource/SourceBufferList.idl',
             'Modules/mediastream/DOMWindowMediaStream.idl',
             'Modules/mediastream/IceCallback.idl',
             'Modules/mediastream/IceCandidate.idl',
             'Modules/mediastream/LocalMediaStream.idl',
             'Modules/mediastream/MediaStream.idl',
             'Modules/mediastream/MediaStreamEvent.idl',
             'Modules/mediastream/MediaStreamList.idl',
             'Modules/mediastream/MediaStreamTrack.idl',
@@ skipping 694 matching lines @@
             'Modules/intents/DeliveredIntent.h',
             'Modules/intents/DOMWindowIntents.cpp',
             'Modules/intents/DOMWindowIntents.h',
             'Modules/intents/Intent.cpp',
             'Modules/intents/Intent.h',
             'Modules/intents/IntentRequest.cpp',
             'Modules/intents/IntentRequest.h',
             'Modules/intents/IntentResultCallback.h',
             'Modules/intents/NavigatorIntents.cpp',
             'Modules/intents/NavigatorIntents.h',
-            'Modules/mediasource/MediaSource.cpp',
-            'Modules/mediasource/MediaSource.h',
-            'Modules/mediasource/MediaSourceRegistry.cpp',
-            'Modules/mediasource/MediaSourceRegistry.h',
             'Modules/mediasource/SourceBuffer.cpp',
             'Modules/mediasource/SourceBuffer.h',
             'Modules/mediasource/SourceBufferList.cpp',
             'Modules/mediasource/SourceBufferList.h',
             'Modules/mediastream/IceCallback.h',
             'Modules/mediastream/IceCandidate.cpp',
             'Modules/mediastream/IceCandidate.h',
             'Modules/mediastream/LocalMediaStream.cpp',
             'Modules/mediastream/LocalMediaStream.h',
             'Modules/mediastream/MediaStream.cpp',
@@ skipping 6876 matching lines @@
             'platform/graphics/chromium/cc/CCVideoLayerImpl.cpp',
             'platform/graphics/chromium/cc/CCVideoLayerImpl.h',
             'platform/graphics/chromium/cc/CCYUVVideoDrawQuad.cpp',
             'platform/graphics/chromium/cc/CCYUVVideoDrawQuad.h',
         ],
         'export_file_generator_files': [
             '<(PRODUCT_DIR)/DerivedSources/WebCore/ExportFileGenerator.cpp',
         ],
     }
 }