Remove Rietveld CQ config.
Remove Rietveld CQ config.

Rietveld CQ has already been disabled and is no longer supoorted.

TBR=phoglund@chromium.org

No-Try: True
Bug: chromium:770592
Change-Id: I2679e9193dfb5ec751bdc76d35fe5d835b44bd0a
Reviewed-on: https://chromium-review.googlesource.com/714302
Reviewed-by: Henrik Kjellander <60c11d3e646624f25a02b88f51d51ca6b7ff7c72@chromium.org>
Commit-Queue: Andrii Shyshkalov <a30c74fa30536fe7ea81ed6dec202e35e149e1fd@chromium.org>

lemenkov/libyuv,lemenkov/libyuv,lemenkov/libyuv,lemenkov/libyuv