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After this CL, it's possible to enable on-clobber contextual web
ZeroSuggest without being forced to also enable on-focus contextual web.

Previously, this was not possible, and you HAD to enable on-focus
contextual web ZeroSuggest in order to make on-clobber work.

In other words:

Before this CL:
  To enable on-focus only:
    - kOnFocusSuggestionsContextualWeb
  To enable on-clobber only:
    - NOT POSSIBLE
  To enable both:
    - kOnFocusSuggestionsContextualWeb
    - kClobberTriggersContextualWebZeroSuggest

After this CL:
  To enable on-focus only:
    - kOnFocusSuggestionsContextualWeb
  To enable on-clobber only:
    - kClobberTriggersContextualWebZeroSuggest
  To enable both:
    - kOnFocusSuggestionsContextualWeb
    - kClobberTriggersContextualWebZeroSuggest

Bug: 1106096
Change-Id: Ia75bacc868549013463bf84afb55d28054d0beed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364138Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799976}