GN fixes to make webkit_unit_tests link on android
GN fixes to make webkit_unit_tests link on android

Linux sometimes means android too.

R=brettw@chromium.org

Review URL: https://codereview.chromium.org/556143002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@181706 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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