Change NeedKeyCB to use std::vector.

media/base/demuxer.h

Index: media/base/demuxer.h
diff --git a/media/base/demuxer.h b/media/base/demuxer.h
index 81ac33b06526ee5045855125f471ae1f2cdd4a0d..4fc40b52306d5f4ee614f1a45b32df692eb3b5ad 100644
--- a/media/base/demuxer.h
+++ b/media/base/demuxer.h
@@ -29,6 +29,12 @@ class MEDIA_EXPORT DemuxerHost : public DataSourceHost {
 
 class MEDIA_EXPORT Demuxer {
  public:
+  // A new potentially encrypted stream has been parsed.
+  // First parameter - The type of initialization data.
+  // Second parameter - The initialization data associated with the stream.
+  typedef base::Callback<void(const std::string& type,
+                              const std::vector<uint8>& init_data)> NeedKeyCB;
+
   Demuxer();
   virtual ~Demuxer();