[microdump] Fix hw architecture indication in build fingerprint line

r1456 introduced the possibility to customize the OS-line of the
microdump, enabling to replace, in the case of android, the generic
uname() info with the Android build fingerprint.
While doing that, it mistakenly removed the HW architecture indication
from the format.
See crbug.com/520075 for more details.

BUG=chromium:520075
R=mmandlis@chromium.org, torne@chromium.org

Review URL: https://codereview.chromium.org/1288313002 .

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk/src@1489 4c0a9323-5329-0410-9bdc-e9ce6186880e
2 files changed