media: Use new wrapper types for media mojo interfaces

media/mojo/interfaces/media_types.mojom

Index: media/mojo/interfaces/media_types.mojom
diff --git a/media/mojo/interfaces/media_types.mojom b/media/mojo/interfaces/media_types.mojom
index 88feb20527d3c2ddcc89ba6c6666ea30236b4778..e26e98769660e202396c20b83608fbe16945b3f4 100644
--- a/media/mojo/interfaces/media_types.mojom
+++ b/media/mojo/interfaces/media_types.mojom
@@ -220,7 +220,7 @@ struct AudioDecoderConfig {
   SampleFormat sample_format;
   ChannelLayout channel_layout;
   int32 samples_per_second;
-  array<uint8>? extra_data;
+  array<uint8> extra_data;
   mojo.common.mojom.TimeDelta seek_preroll;
   int32 codec_delay;
   EncryptionScheme encryption_scheme;
@@ -236,7 +236,7 @@ struct VideoDecoderConfig {
   gfx.mojom.Size coded_size;
   gfx.mojom.Rect visible_rect;
   gfx.mojom.Size natural_size;
-  array<uint8>? extra_data;
+  array<uint8> extra_data;
   EncryptionScheme encryption_scheme;
 };
 
@@ -264,9 +264,8 @@ struct DecoderBuffer {
   // Indicates whether or not this buffer is a random access point.
   bool is_key_frame;
 
-  // This is backed by an std::vector and results in a few copies.
-  // Into the vector, onto and off the MessagePipe, back into a vector.
-  array<uint8>? side_data;
+  // Empty when |side_data| doesn't exist.
+  array<uint8> side_data;
 
   // DecryptConfig for a encrypted buffer. NULL if the buffer is not encrypted.
   DecryptConfig? decrypt_config;
@@ -302,8 +301,8 @@ struct AudioBuffer {
   // Timestamp in microseconds of the first frame.
   mojo.common.mojom.TimeDelta timestamp;
 
-  // Channel data. Will be null for EOS buffers.
-  array<uint8>? data;
+  // Channel data. Will be empty for EOS buffers.
+  array<uint8> data;
 };
 
 // This defines a mojo transport format for media::VideoFrame.