[Cleanup] Remove the ability to disable Crash Reporting from the command line.

This was previously used by the ClusterFuzz project, but is no longer needed, as
that project simply does not set the user consent bit for upload crash reports.

BUG=none
TEST=none
R=jchinlee@chromium.org, mariakhomenko@chromium.org
TBR=tobiasjs@chromium.org

Review-Url: https://codereview.chromium.org/2756463004
Cr-Commit-Position: refs/heads/master@{#457867}
13 files changed