telemetry_unittests: Disable ScrollActionTest.testScrollAction

TBR=dominikg@chromium.org
BUG=330544

Review URL: https://codereview.chromium.org/120793002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242386 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242386