Removed unused NeedKey callback from Decryptors.

media/crypto/aes_decryptor.h

Index: media/crypto/aes_decryptor.h
diff --git a/media/crypto/aes_decryptor.h b/media/crypto/aes_decryptor.h
index e838bdf95652d34ba3bfc750dc152bfb4ed58971..aec55d757d4a086243e5cad68daaea45fb257df1 100644
--- a/media/crypto/aes_decryptor.h
+++ b/media/crypto/aes_decryptor.h
@@ -29,8 +29,7 @@ class MEDIA_EXPORT AesDecryptor : public MediaKeys, public Decryptor {
  public:
   AesDecryptor(const KeyAddedCB& key_added_cb,
                const KeyErrorCB& key_error_cb,
-               const KeyMessageCB& key_message_cb,
-               const NeedKeyCB& need_key_cb);
+               const KeyMessageCB& key_message_cb);
   virtual ~AesDecryptor();
 
   // MediaKeys implementation.
@@ -98,7 +97,6 @@ class MEDIA_EXPORT AesDecryptor : public MediaKeys, public Decryptor {
   KeyAddedCB key_added_cb_;
   KeyErrorCB key_error_cb_;
   KeyMessageCB key_message_cb_;
-  NeedKeyCB need_key_cb_;
 
   // KeyMap owns the DecryptionKey* and must delete them when they are
   // not needed any more.