Make unprefixed EME APIs use platform and Chromium.

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': [],
 
@@ skipping 198 matching lines @@
       'device_orientation/DeviceMotionData.cpp',
       'device_orientation/DeviceMotionData.h',
       'device_orientation/DeviceMotionDispatcher.cpp',
       'device_orientation/DeviceMotionDispatcher.h',
       'device_orientation/DeviceMotionEvent.h',
       'device_orientation/DeviceMotionEvent.cpp',
       'device_orientation/DeviceRotationRate.cpp',
       'device_orientation/DeviceRotationRate.h',
       'donottrack/NavigatorDoNotTrack.cpp',
       'donottrack/NavigatorDoNotTrack.h',
-      'encryptedmedia/CDM.cpp',
-      'encryptedmedia/CDM.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 459 matching lines @@
       'websockets/WorkerThreadableWebSocketChannel.cpp',
       'websockets/WorkerThreadableWebSocketChannel.h',
     ],
     'modules_unittest_files': [
       'websockets/WebSocketDeflaterTest.cpp',
       'websockets/WebSocketExtensionDispatcherTest.cpp',
       'websockets/WebSocketPerMessageDeflateTest.cpp',
     ],
   },
 }