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The untrusted delay mode provides an option to reduce the "known delay" parameter passed down to the core AEC. This is necessary to handle the very low latencies observed with the Chromium audio backend on Mac. Prior to this change, it was possible to pass a negative value. The AEC produced good output in practice, but it turned out this tripped a heretofore unnoticed assert in ProcessBlock(). This change avoids the assert, and maintains the good output across a set of Mac recordings. Bit-exact in some cases, and in the remaining, quickly converging to identical output. The assert was hit on the last webrtc roll in Chromium in content_browsertests on Mac. Corresponds to: https://chromereviews.googleplex.com/9960013 TBR=bjornv TESTED=Verified locally that "content_browsertests --gtest_filter=WebrtcBrowserTest.*"" passes. Review URL: https://webrtc-codereview.appspot.com/2328005 git-svn-id: http://webrtc.googlecode.com/svn/trunk@4886 4adac7df-926f-26a2-2b94-8c16560cd09d