Remove remaining uses of KeySystemInfo and InitDataTypeMask

content/public/renderer/content_renderer_client.cc

Index: content/public/renderer/content_renderer_client.cc
diff --git a/content/public/renderer/content_renderer_client.cc b/content/public/renderer/content_renderer_client.cc
index 16e2df1b21f8ffca47d62573ea51f4b3930f366d..4ad49c837457f80bed69b33a7476de1b25c4f2bf 100644
--- a/content/public/renderer/content_renderer_client.cc
+++ b/content/public/renderer/content_renderer_client.cc
@@ -163,10 +163,6 @@ bool ContentRendererClient::AllowPepperMediaStreamAPI(const GURL& url) {
   return false;
 }
 
-void ContentRendererClient::AddKeySystems(
-    std::vector<media::KeySystemInfo>* key_systems) {
-}
-
 void ContentRendererClient::AddSupportedKeySystems(
     std::vector<std::unique_ptr<media::KeySystemProperties>>* key_systems) {}