Media: Do not support new codecs with legacy MIME type names.

media/base/mime_util_internal.h

Index: media/base/mime_util_internal.h
diff --git a/media/base/mime_util_internal.h b/media/base/mime_util_internal.h
index 5e06b54fc8b3fbd944e2e99113a5647d2471ad11..815d1cb79d0c044670fb967f1e04e3831d006c7e 100644
--- a/media/base/mime_util_internal.h
+++ b/media/base/mime_util_internal.h
@@ -87,9 +87,17 @@ class MEDIA_EXPORT MimeUtil {
   };
   typedef std::map<std::string, CodecEntry> StringToCodecMappings;
 
-  // For faster lookup, keep hash sets.
+  // Initializes the supported media types into hash sets for faster lookup.
   void InitializeMimeTypeMaps();
 
+  // Initializes the supported media formats (|media_format_map_|).
+  void AddSupportedMediaFormats();
+
+  // Adds |mime_type| with the specified codecs to |media_format_map_|.
+  void AddContainerWithCodecs(const std::string& mime_type,
+                              const std::string& codecs_list,
+                              bool is_proprietary_mime_type);
+
   // Returns IsSupported if all codec IDs in |codecs| are unambiguous and are
   // supported in |mime_type_lower_case|. MayBeSupported is returned if at least
   // one codec ID in |codecs| is ambiguous but all the codecs are supported.
@@ -144,8 +152,9 @@ class MEDIA_EXPORT MimeUtil {
   // A map of mime_types and hash map of the supported codecs for the mime_type.
   MediaFormatMappings media_format_map_;
 
-  // Keeps track of whether proprietary codec support should be
-  // advertised to callers.
+  // List of proprietary containers in |media_format_map_|.
+  std::vector<std::string> proprietary_media_containers_;
+  // Whether proprietary codec support should be advertised to callers.
   bool allow_proprietary_codecs_;
 
   // Lookup table for string compare based string -> Codec mappings.