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This makes it much easier to analyse CDM crashes.

Tested with --enable-crash-reporter-for-testing, which will upload
a crash report and print a crash ID to stdout. Then confirmed that
we have the CDM version in the crash report.

See crash ID 27c2f5df78d977e227 for an example crash.

BUG=788937

Change-Id: Ifa565f0d01a78cfef2329704ea3bc3feb9a5723a
Reviewed-on: https://chromium-review.googlesource.com/792258
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521805}