Disable FeedbackApiTest.Basic on Linux

BUG=297414
TBR=rkc@chromium.org

Review URL: https://codereview.chromium.org/23514080

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@224910 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 224910