Reason for revert: Speculative revert for perf regression. Original issue's description: > Remove VCMQmRobustness. > > Class contained a lot of not-really-wired-up functionality that ended up > being complicated ways of saying return 1; or return false;. This > removes this dependency that complicates code readability significantly. > > BUG=webrtc:5066 > R=marpan@google.com, marpan@webrtc.org > TBR=stefan@webrtc.org > > Committed: https://crrev.com/73894369791cb5eedc8788baf918ec07d11d351d > Cr-Commit-Position: refs/heads/master@{#12516} TBR=marpan@webrtc.org,stefan@webrtc.org,marpan@google.com # Not skipping CQ checks because original CL landed more than 1 days ago. BUG=webrtc:5066, chromium:607838 Review-Url: https://codereview.webrtc.org/1935753002 Cr-Commit-Position: refs/heads/master@{#12572}