Use 'pssh' data to determine key_id properly

media/cdm/cenc_utils.h

Index: media/cdm/cenc_utils.h
diff --git a/media/cdm/cenc_utils.h b/media/cdm/cenc_utils.h
index 7dd82a1537ff7edf656fc6a4c9b23c785c685c52..8938fb92582a6d387db5dae73f99a9e2de4c33c2 100644
--- a/media/cdm/cenc_utils.h
+++ b/media/cdm/cenc_utils.h
@@ -21,10 +21,6 @@ MEDIA_EXPORT bool ValidatePsshInput(const std::vector<uint8_t>& input);
 // more concatenated 'pssh' boxes. If |input| looks valid, then true is
 // returned and |key_ids| is updated to contain the values found. Otherwise
 // return false.
-// TODO(jrummell): This returns true if no Common SystemID 'pssh' boxes are
-// found, or are included but don't contain any key IDs. This should be
-// fixed once the test files are updated to include correct 'pssh' boxes.
-// http://crbug.com/460308
 MEDIA_EXPORT bool GetKeyIdsForCommonSystemId(const std::vector<uint8_t>& input,
                                              KeyIdList* key_ids);