This action was used by inspector for blackboxing and isn't needed with new blackboxing implementation inside V8.

BUG=none
R=yangguo@chromium.org,clemensh@chromium.org
TBR=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2650943011
Cr-Commit-Position: refs/heads/master@{#42670}