crash-reporter: detect guest mode and defer crash sending

Change-Id: I8952fc6e701521dbb8618889d96ebc025f713427

BUG=7203
TEST=Ran BVTs

Review URL: http://codereview.chromium.org/3520011
1 file changed
tree: b39c1f3c38ec7d3caefd05fd05345dba75faa1cc
  1. crash_reporter/