crash-reporter: add missing header file from last commit

Change-Id: I85fd4f6b4eb851209e36d4ba803889abd00bf274

TBR=petkov

BUG=7987
TEST=unittests pass

Review URL: http://codereview.chromium.org/4649002
1 file changed
tree: 6d70fdb97d253a552955c3c17ababdd3279e8465
  1. crash_reporter/