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Merge "Do not allow registration of null callbacks"
authorTreeHugger Robot <treehugger-gerrit@google.com>
Sat, 23 Mar 2019 00:52:07 +0000 (00:52 +0000)
committerAndroid (Google) Code Review <android-gerrit@google.com>
Sat, 23 Mar 2019 00:52:07 +0000 (00:52 +0000)

Trivial merge