This CL is a manual spin-off of [1], which tried to apply clang-tidy's performance-move-const-arg [1] to the WebRTC codebase. Since there were some wrong fixes to correct, this CL lands a few different fixes, like adding a constructor overload to take an rvalue reference or remove 'const' to make std::move effective. [1] - https://webrtc-review.googlesource.com/c/src/+/120350 [2] - https://clang.llvm.org/extra/clang-tidy/checks/performance-move-const-arg.html Bug: webrtc:10252 Change-Id: I42a777247fee2cb788efcd7c2035148330056b7a Reviewed-on: https://webrtc-review.googlesource.com/c/120928 Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#26553}