Modify crash-reporter to collect crash information for unofficial builds.

The original code review link is here: http://codereview.chromium.org/6559003/

BUG=chromium-os:12207
TESTS=logging_UserCrash, logging_CrashSender, manual test which involves
purposely crashing a test to determine if minidump information is properly collected

Change-Id: I20274050cd698434951c65612e246f510c8082cb

TEST=

Review URL: http://codereview.chromium.org/6615021
3 files changed