Update xpdual/moz/total_byte_r.
Update xpdual/moz/total_byte_r.

Looks like this result can be flaky, so give it a new
delta and var to keep the step green most of the time.

BUG=none
TEST=xpdual/moz is green
TBR=nsylvain@chromium.org

Review URL: http://codereview.chromium.org/3158003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@55623 0039d316-1c4b-4281-b951-d872f2087c98

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