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Edward Jung authored
Adding this option allows UI to set the visibility of the 'Back to safety' button. Webview: Set to false, so the button would only be shown where there is a page to go back to. Chromium: option is always set to true so always show the Back to safety button. Where there is no previous page, the user is taken to the new tab page. Bug: 760383 Change-Id: I8857b6bf2ff977c572f507f817bf815307453c13 Reviewed-on: https://chromium-review.googlesource.com/641435 Reviewed-by: Jialiu Lin <jialiul@chromium.org> Reviewed-by: Adrienne Porter Felt <felt@chromium.org> Reviewed-by: Selim Gurun <sgurun@chromium.org> Reviewed-by: Nate Fischer <ntfschr@chromium.org> Commit-Queue: Edward Jung <edwardjung@chromium.org> Cr-Commit-Position: refs/heads/master@{#501227}
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