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Updating code w.r.t. coding conventions:
https://chromium.googlesource.com/chromium/src/+/lkgr/styleguide/c++/c++.md#object-ownership-and-calling-conventions

Bug: 968109
Change-Id: Ib6aef90f69bfc10e7fe792502456427fce82a0e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1639217Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Vladislav Kuzkokov <vkuzkokov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665525}