Remove unused voe_cpu_test.cc.

BUG=webrtc:4690

Review-Url: https://codereview.webrtc.org/2686003004
Cr-Original-Commit-Position: refs/heads/master@{#16508}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 1752a107915d589948042e9eb31422f0f5bbbab9
5 files changed