media config: expand is_encrypted to a struct.

media/cast/sender/h264_vt_encoder_unittest.cc

Index: media/cast/sender/h264_vt_encoder_unittest.cc
diff --git a/media/cast/sender/h264_vt_encoder_unittest.cc b/media/cast/sender/h264_vt_encoder_unittest.cc
index ece6ed4a4ce50f75121f5455b17f2b6e5cf838c3..45fd52d5dfd669c38461ce33909e7611dcdbf8a3 100644
--- a/media/cast/sender/h264_vt_encoder_unittest.cc
+++ b/media/cast/sender/h264_vt_encoder_unittest.cc
@@ -314,7 +314,7 @@ TEST_F(H264VideoToolboxEncoderTest, CheckFramesAreDecodable) {
   VideoDecoderConfig config(kCodecH264, H264PROFILE_MAIN, frame_->format(),
                             COLOR_SPACE_UNSPECIFIED, frame_->coded_size(),
                             frame_->visible_rect(), frame_->natural_size(),
-                            EmptyExtraData(), false);
+                            EmptyExtraData(), Unencrypted());
   scoped_refptr<EndToEndFrameChecker> checker(new EndToEndFrameChecker(config));
 
   VideoEncoder::FrameEncodedCallback cb =