Set callback interface on WebCDMSessionImpl after creation.

content/renderer/media/cdm_session_adapter.cc

Index: content/renderer/media/cdm_session_adapter.cc
diff --git a/content/renderer/media/cdm_session_adapter.cc b/content/renderer/media/cdm_session_adapter.cc
index e4c97e313e1344ce6be8ec443ec48738265cba0c..9a84d544c9820abc929dad372dbb02ff74b09bdb 100644
--- a/content/renderer/media/cdm_session_adapter.cc
+++ b/content/renderer/media/cdm_session_adapter.cc
@@ -51,9 +51,8 @@ bool CdmSessionAdapter::Initialize(
   return media_keys_;
 }
 
-WebContentDecryptionModuleSessionImpl* CdmSessionAdapter::CreateSession(
-    blink::WebContentDecryptionModuleSession::Client* client) {
-  return new WebContentDecryptionModuleSessionImpl(client, this);
+WebContentDecryptionModuleSessionImpl* CdmSessionAdapter::CreateSession() {
+  return new WebContentDecryptionModuleSessionImpl(this);
 }
 
 bool CdmSessionAdapter::RegisterSession(