CRAS: rclient_unittest - remove unused variable
CRAS: rclient_unittest - remove unused variable

This actually fixes the warning in the clang 3.5 that
'base class 'RClientMessagesSuite' has a flexible array member'
Removing that variable fixes this problem.

BUG=chromium:342495
TEST=FEATURES="test" emerge-lumpy adhd passes.

Change-Id: I024afedbe19b1fb4e561076d883b896ce57af8bb
Reviewed-on: https://chromium-review.googlesource.com/185750
Reviewed-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>
Commit-Queue: Yunlian Jiang <8ca9e07d8da722742b3f5a8340e0afab8cf1248e@chromium.org>
Tested-by: Yunlian Jiang <8ca9e07d8da722742b3f5a8340e0afab8cf1248e@chromium.org>

drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd