The process uptime computation when the Windows out-of-process Crash Generation
Server is used is done by subtracting the crashing process creation time from
the current time when the crash is generated:

  uptime = now - process_creation_time

There was a bug and instead of the process creation time the code was using the
time when the process was registered with the Crash Generation Server.

R=mark@chromium.org

Review URL: https://breakpad.appspot.com/1744002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1391 4c0a9323-5329-0410-9bdc-e9ce6186880e