Marking some actions as not_user_triggered.
Marking some actions as not_user_triggered.

This includes some BrowserPluginGuest actions, and WebView.WebRequest.AddListener.

BUG=

Review URL: https://codereview.chromium.org/1564573003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#368125}

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