Skip a bunch of media layout tests
Skip a bunch of media layout tests

BUG=16779

A large number of layout tests must fail because they use
test files in H264/AAC format which the test_shell on
build slaves doesn't support (They use chromium-braneded
build).

Review URL: http://codereview.chromium.org/169019

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@23488 0039d316-1c4b-4281-b951-d872f2087c98

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