Implement checks for distinctiveIdentifier and persistentState in requestMediaKeySystemAccess().

chromecast/renderer/key_systems_cast.h

Index: chromecast/renderer/key_systems_cast.h
diff --git a/chromecast/renderer/key_systems_cast.h b/chromecast/renderer/key_systems_cast.h
index 36b21d5d045f8002a2bfc7e997940c17da8c82f1..bd3eec42283a34e20d51629aad1f31337015c81f 100644
--- a/chromecast/renderer/key_systems_cast.h
+++ b/chromecast/renderer/key_systems_cast.h
@@ -12,17 +12,12 @@
 namespace chromecast {
 namespace shell {
 
-// Adds a single key system by name.
-void AddKeySystemWithCodecs(
-    const std::string& key_system_name,
-    std::vector< ::media::KeySystemInfo>* concrete_key_systems);
-
 void AddChromecastKeySystems(
-    std::vector< ::media::KeySystemInfo>* key_systems_info);
+    std::vector<::media::KeySystemInfo>* key_systems_info);
 
 // TODO(gunsch): Remove when prefixed EME is removed.
 void AddChromecastPlatformKeySystems(
-    std::vector< ::media::KeySystemInfo>* key_systems_info);
+    std::vector<::media::KeySystemInfo>* key_systems_info);
 
 }  // namespace shell
 }  // namespace chromecast