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|CrashTab| uses 0 as the exit code which makes the process appear to
have terminated normally. The exit code passed to
|RenderProcessHost::Shutdown| is only actually used on Windows, so this
still appeared as a crash on other platforms.

We now specify a non-zero exit code, so that callers of |CrashTab|
observe a crash on Windows.

Bug: None
Change-Id: Iaafca2aeed50612ad0de01d06f65183e11d63783
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303988
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790192}