Remove headers in mojo and data_decoder sources list

Some headers appeared twice in some sources list. This confused
some other tools so it seems like a good idea
to only have them there once.

Change-Id: Ifa0c7b2e0fbb8b7ec401bad2737384cffa3d940a
Reviewed-on: https://chromium-review.googlesource.com/c/1290949
Reviewed-by: Jay Civelli <jcivelli@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#601177}
2 files changed