Mirko Bonadei 2a8231063c Avoiding unnecessary copies.
clang-tidy spotted out these unnecessary copies, this CL removes them.

Bug: None
Change-Id: I9035a5a5394e170e8193966b4790946fb22b3b76
No-Try: True
Reviewed-on: https://webrtc-review.googlesource.com/22060
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20648}
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