Fix build after r153081

TBR=abarth

Review URL: https://codereview.chromium.org/17887006

git-svn-id: svn://svn.chromium.org/blink/trunk@153085 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Fix condition in webkit_unit_tests_apk dependency

Not sure, why has it only started to manifest itself recently, but
it anyway seems logical to maintain the same condition on the target
and on the dependency reference.

TBR=mkosiba@chromium.org

Review URL: https://codereview.chromium.org/17904005

git-svn-id: svn://svn.chromium.org/blink/trunk@153086 bbb929c8-8fbe-4397-9dbb-9b2b20218538