Revert "Take arguments by const reference"

This reverts commit 069fb341.

This breaks Linux build because the function declaration doesn't match
the callback declaration. We will need to change both locations to pass
the vector by reference.

Bug: 190749285
Tag: #floss
Test: Compile for Linux
Change-Id: I8dcb1376e2d53d944190eccb2c33b933299193d4