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This CL hides the "Site setting" action when notifications are shown by WebAPKs.
The "additional settings in the app" link will be removed from the notification
settings for WebAPKs in the System UI in Android O. Before Android O, the
settings gear to open app-specific settings shown on the rear of a notification
following a long-press will be gone as well.

BUG=654539

Review-Url: https://codereview.chromium.org/2826223002
Cr-Commit-Position: refs/heads/master@{#467843}