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No change to logic, only docs. This clarifies that embedders may return
the empty string from GetAppPackageName() for privacy concerns
(previously this was not documented as a supported case).

This removes embedder-specific terminology from the metrics component,
and clarifies WebView's behavior in its method override.

Bug: 969803
Test: N/A
Change-Id: Idb57e4de11cc8c40b58f95a012a5110ba9bdf8b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1897012Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712688}