Revert of media config: expand is_encrypted to a struct.

media/base/media_util.cc

Index: media/base/media_util.cc
diff --git a/media/base/media_util.cc b/media/base/media_util.cc
index a6516cd23058a1795f144fa23b1e57c6cc5c270a..bd7929f56099685cbb466760695f7a3454acb4ff 100644
--- a/media/base/media_util.cc
+++ b/media/base/media_util.cc
@@ -10,13 +10,4 @@
   return std::vector<uint8_t>();
 }
 
-EncryptionScheme Unencrypted() {
-  return EncryptionScheme();
-}
-
-EncryptionScheme AesCtrEncryptionScheme() {
-  return EncryptionScheme(EncryptionScheme::CIPHER_MODE_AES_CTR,
-                          EncryptionScheme::Pattern());
-}
-
 }  // namespace media