Revert^3 "Change the way tombstones are added to dropbox."

This reverts commit 225bfb760a3dade91aa599a86ecc3e818fa96b20.

Reason for revert: We are possibly losing tombstones

Change-Id: I8372ae3b7b5db63bc48155eca63eb3cae41239c8
diff --git a/ProtoLibraries.bp b/ProtoLibraries.bp
index d03bbd2..e7adf20 100644
--- a/ProtoLibraries.bp
+++ b/ProtoLibraries.bp
@@ -34,6 +34,7 @@
         ":ipconnectivity-proto-src",
         ":libstats_atom_enum_protos",
         ":libstats_atom_message_protos",
+        ":libtombstone_proto-src",
         "core/proto/**/*.proto",
         "libs/incident/**/*.proto",
     ],