Removed unused NeedKey callback from Decryptors.

webkit/plugins/ppapi/content_decryptor_delegate.cc

Index: webkit/plugins/ppapi/content_decryptor_delegate.cc
diff --git a/webkit/plugins/ppapi/content_decryptor_delegate.cc b/webkit/plugins/ppapi/content_decryptor_delegate.cc
index f682c444d9c63c68368ae3d935cf2087b0967b44..c2dffc3d2aef5fa65c103330556fda4e3b19ea6e 100644
--- a/webkit/plugins/ppapi/content_decryptor_delegate.cc
+++ b/webkit/plugins/ppapi/content_decryptor_delegate.cc
@@ -294,12 +294,10 @@ void ContentDecryptorDelegate::Initialize(const std::string& key_system) {
 void ContentDecryptorDelegate::SetKeyEventCallbacks(
     const media::KeyAddedCB& key_added_cb,
     const media::KeyErrorCB& key_error_cb,
-    const media::KeyMessageCB& key_message_cb,
-    const media::NeedKeyCB& need_key_cb) {
+    const media::KeyMessageCB& key_message_cb) {
   key_added_cb_ = key_added_cb;
   key_error_cb_ = key_error_cb;
   key_message_cb_ = key_message_cb;
-  need_key_cb_ = need_key_cb;
 }
 
 bool ContentDecryptorDelegate::GenerateKeyRequest(const std::string& type,