Fix the network quality browser test

Initialize the value of a variable to avoid triggering
use of uninitialized variable error

Bug: 819244
Change-Id: Ida4ccc55c872ebaeb54d41c35f237e6930c8aa7b
TBR: xunjieli@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/1117932
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571032}
1 file changed