https://codereview.chromium.org/1799713002 moved gpu_host_messages from content/common to content/gpu.
gpu_host_messages is used by content/browser. This introduces a path browser -> gpu -> child -> blink, but the browser should not be linking blink (or child at all). GPU is a "child" process.
Comment 1 by fsam...@chromium.org
, Mar 22 2016