Removing and unflaking tests in WorkerTest
Removing and unflaking tests in WorkerTest

1) Remove tests for dedicated workers that are now run as layout tests
2) Unflake tests that are no longer flaky (per dashboard).

Review URL: https://chromiumcodereview.appspot.com/9317061

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@120258 0039d316-1c4b-4281-b951-d872f2087c98

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