Fix mime type mappings when the unified media pipeline is enabled.

media/base/mime_util.h

Index: media/base/mime_util.h
diff --git a/media/base/mime_util.h b/media/base/mime_util.h
index 058953e6a33357d46df77141b0ed656e3e423fac..e4c99d6c6ba34dccff6bda3cbdb6b4349191cf09 100644
--- a/media/base/mime_util.h
+++ b/media/base/mime_util.h
@@ -56,6 +56,11 @@ MEDIA_EXPORT SupportsType
 IsSupportedMediaFormat(const std::string& mime_type,
                        const std::vector<std::string>& codecs);
 
+// Similar to the above, but for encrypted formats.
+MEDIA_EXPORT SupportsType
+IsSupportedEncryptedMediaFormat(const std::string& mime_type,
+                                const std::vector<std::string>& codecs);
+
 // Test only method that removes proprietary media types and codecs from the
 // list of supported MIME types and codecs. These types and codecs must be
 // removed to ensure consistent layout test results across all Chromium