GitLab

Improve the doc comment for the GN arg "system_webview_package_name" to
mention that it controls TrichromeWebView as well as SystemWebView, and
to explain more about why you might want to use it.

Change-Id: I4c4c6e003416c9e2f39ab2492078baaa049237b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1575732
Commit-Queue: Richard Coles <torne@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652614}