Mark AutomationProxyTest2.GetTabTitle flaky.
Mark AutomationProxyTest2.GetTabTitle flaky.

AutomationProxyTest2.GetTabTitle has been failing often on Mac only.
Marking flaky.

BUG=98071
TBR=stoyan@chromium.org

Review URL: http://codereview.chromium.org/8060010

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@102917 0039d316-1c4b-4281-b951-d872f2087c98

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