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AutoplayAllowedInIframe has been timing out on Linux; this CL disables
the test on that platform.

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=browser_tests%20(with%20patch)&tests=AutoplayExtensionBrowserTest.AutoplayAllowedInIframe

R=rdevlin.cronin

Bug: 1166927
Change-Id: I8812965c620729ccf3f1252dfa27358a224dc30f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2631406
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Auto-Submit: David Van Cleve <davidvc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844050}