M-56: Replace mojo::MakeRequest with mojo::GetProxy.

Cherry-picking 86dfcea3340fe31e9b44123163b90501df9ffde8 introduced usage
of mojo::MakeRequest which does not exist on this branch.

BUG=679929
TBR=bustamante@chromium.org

Review-Url: https://codereview.chromium.org/2624893002 .
Cr-Commit-Position: refs/branch-heads/2924@{#724}
Cr-Branched-From: 3a87aecc31cd1ffe751dd72c04e5a96a1fc8108a-refs/heads/master@{#433059}
1 file changed