[webcrypto] Replace KeyAlgorithm interfaces with an Object.

Source/modules/modules.gypi

 {
   'includes': [
     '../core/core_generated.gypi',
     'modules_generated.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
     'modules_idl_files': [
       '<@(extra_blink_module_idl_files)',
       'battery/BatteryManager.idl',
-      'crypto/AesKeyAlgorithm.idl',
       'crypto/Crypto.idl',
       'crypto/CryptoKey.idl',
-      'crypto/HmacKeyAlgorithm.idl',
-      'crypto/KeyAlgorithm.idl',
-      'crypto/RsaHashedKeyAlgorithm.idl',
-      'crypto/RsaKeyAlgorithm.idl',
       'crypto/SubtleCrypto.idl',
       'device_light/DeviceLightEvent.idl',
       'device_orientation/DeviceAcceleration.idl',
       'device_orientation/DeviceMotionEvent.idl',
       'device_orientation/DeviceOrientationEvent.idl',
       'device_orientation/DeviceRotationRate.idl',
       'encoding/TextDecoder.idl',
       'encoding/TextEncoder.idl',
       'encryptedmedia/MediaKeyMessageEvent.idl',
       'encryptedmedia/MediaKeyNeededEvent.idl',
@@ skipping 254 matching lines @@
       'battery/BatteryDispatcher.cpp',
       'battery/BatteryDispatcher.h',
       'battery/BatteryManager.cpp',
       'battery/BatteryManager.h',
       'battery/BatteryStatus.cpp',
       'battery/BatteryStatus.h',
       'battery/NavigatorBattery.cpp',
       'battery/NavigatorBattery.h',
       'beacon/NavigatorBeacon.cpp',
       'beacon/NavigatorBeacon.h',
-      'crypto/AesKeyAlgorithm.cpp',
-      'crypto/AesKeyAlgorithm.h',
       'crypto/Crypto.cpp',
       'crypto/Crypto.h',
       'crypto/CryptoKey.cpp',
       'crypto/CryptoKey.h',
       'crypto/CryptoResultImpl.cpp',
       'crypto/CryptoResultImpl.h',
       'crypto/DOMWindowCrypto.cpp',
       'crypto/DOMWindowCrypto.h',
-      'crypto/HmacKeyAlgorithm.cpp',
-      'crypto/HmacKeyAlgorithm.h',
-      'crypto/KeyAlgorithm.cpp',
-      'crypto/KeyAlgorithm.h',
       'crypto/NormalizeAlgorithm.cpp',
       'crypto/NormalizeAlgorithm.h',
-      'crypto/RsaHashedKeyAlgorithm.cpp',
-      'crypto/RsaHashedKeyAlgorithm.h',
-      'crypto/RsaKeyAlgorithm.cpp',
-      'crypto/RsaKeyAlgorithm.h',
       'crypto/SubtleCrypto.cpp',
       'crypto/SubtleCrypto.h',
       'crypto/WorkerGlobalScopeCrypto.cpp',
       'crypto/WorkerGlobalScopeCrypto.h',
       'device_light/DeviceLightController.cpp',
       'device_light/DeviceLightController.h',
       'device_light/DeviceLightDispatcher.cpp',
       'device_light/DeviceLightDispatcher.h',
       'device_light/DeviceLightEvent.cpp',
       'device_light/DeviceLightEvent.h',
@@ skipping 646 matching lines @@
       'indexeddb/IDBRequestTest.cpp',
       'indexeddb/IDBTransactionTest.cpp',
       'websockets/WebSocketDeflaterTest.cpp',
       'websockets/WebSocketExtensionDispatcherTest.cpp',
       'websockets/WebSocketExtensionParserTest.cpp',
       'websockets/WebSocketPerMessageDeflateTest.cpp',
       'websockets/WebSocketTest.cpp',
     ],
   },
 }