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ShellDevToolsFrontend::RenderProcessGone's functionality is now entirely
contained in LayoutTestDevToolsFrontend; I should have removed this
definition in https://codereview.chromium.org/644723002.

BUG=420994

Review URL: https://codereview.chromium.org/644963002

Cr-Commit-Position: refs/heads/master@{#299081}