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about:tracing UI calls TraceLog::GetKnownCategoryGroups() to get categories to
display in "Record" dialog. This function assumes that built-in categories
shouldn't be displayed.

However, the CL https://crrev.com/c/1251361 made almost all categories built-in,
thus a majority of categories isn't displayed in the UI.

This CL fixes this by narrowing the list of non-displayed categories to "meta"
categories.

Bug: 708990
Change-Id: Ic8ccfa396e890983afda96a20ebfe00557f319a9
Reviewed-on: https://chromium-review.googlesource.com/c/1341909Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Primiano Tucci <primiano@chromium.org>
Commit-Queue: Alexandr Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609344}