crash-reporter: Read core from stdin even if proc files are unsuable.

This CL fixes commit c7c7914f49fbdef0d1f06c13854daabe176621ed such that
UserCollector continues to read the core file from stdin even if the proc
files are unusable.

BUG=chromium-os:24820
TEST=Tested the following:
1. Build crash-reporter and run unit tests.
2. Run the following autotest tests on a Cr48:
   - logging_CrashSender
   - logging_UserCrash

Change-Id: I04d09b15a80344b47f0512196c40e94384c5c323
Reviewed-on: https://gerrit.chromium.org/gerrit/13872
Reviewed-by: Ken Mixter <kmixter@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Commit-Ready: Ben Chan <benchan@chromium.org>
1 file changed
tree: f96bb00e54d177abb6abde7a41fff589bed50598
  1. crash_reporter/