Remove the dependency on encryptedmedia from HTMLMediaElement.

Source/modules/modules.gypi

 {
   'variables': {
     # Experimental hooks for embedder to provide extra IDL and source files.
     #
     # Note: this is not a supported API. If you rely on this, you will be broken
     # from time to time as the code generator changes in backward incompatible
     # ways.
     'extra_blink_module_idl_files': [],
     'extra_blink_module_files': [],
     # Files for which bindings (.cpp and .h files) will be generated
@@ skipping 172 matching lines @@
       'webmidi/MIDISuccessCallback.idl',
       'websockets/CloseEvent.idl',
       'websockets/WebSocket.idl',
     ],
     # 'partial interface' or target (right side of) 'implements'
     'modules_dependency_idl_files': [
       'battery/NavigatorBattery.idl',
       'crypto/WindowCrypto.idl',
       'crypto/WorkerGlobalScopeCrypto.idl',
       'donottrack/NavigatorDoNotTrack.idl',
+      'encryptedmedia/HTMLMediaElementEncryptedMedia.idl',
       'filesystem/DataTransferItemFileSystem.idl',
       'filesystem/HTMLInputElementFileSystem.idl',
       'filesystem/InspectorFrontendHostFileSystem.idl',
       'filesystem/WindowFileSystem.idl',
       'filesystem/WorkerGlobalScopeFileSystem.idl',
       'gamepad/NavigatorGamepad.idl',
       'geolocation/NavigatorGeolocation.idl',
       'imagebitmap/ImageBitmapFactories.idl',
       'imagebitmap/WindowImageBitmapFactories.idl',
       'indexeddb/WindowIndexedDatabase.idl',
@@ skipping 80 matching lines @@
       'device_orientation/DeviceSensorEventController.cpp',
       'device_orientation/DeviceSensorEventController.h',
       'device_orientation/DeviceSensorEventDispatcher.cpp',
       'device_orientation/DeviceSensorEventDispatcher.h',
       'donottrack/NavigatorDoNotTrack.cpp',
       'donottrack/NavigatorDoNotTrack.h',
       'encoding/TextDecoder.cpp',
       'encoding/TextDecoder.h',
       'encoding/TextEncoder.cpp',
       'encoding/TextEncoder.h',
+      'encryptedmedia/HTMLMediaElementEncryptedMedia.cpp',
+      'encryptedmedia/HTMLMediaElementEncryptedMedia.h',
       'encryptedmedia/MediaKeyMessageEvent.cpp',
       'encryptedmedia/MediaKeyMessageEvent.h',
       'encryptedmedia/MediaKeyNeededEvent.cpp',
       'encryptedmedia/MediaKeyNeededEvent.h',
       'encryptedmedia/MediaKeys.cpp',
       'encryptedmedia/MediaKeys.h',
       'encryptedmedia/MediaKeySession.cpp',
       'encryptedmedia/MediaKeySession.h',
       'filesystem/DOMFilePath.cpp',
       'filesystem/DOMFilePath.h',
@@ skipping 573 matching lines @@
       'indexeddb/IDBKeyPathTest.cpp',
       'indexeddb/IDBRequestTest.cpp',
       'indexeddb/IDBTransactionTest.cpp',
       'websockets/WebSocketDeflaterTest.cpp',
       'websockets/WebSocketExtensionDispatcherTest.cpp',
       'websockets/WebSocketExtensionParserTest.cpp',
       'websockets/WebSocketPerMessageDeflateTest.cpp',
     ],
   },
 }