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This CL creates a whole new flag for the On-Content variant of
Contextual Web ZeroSuggest.

Bug: 1087700
Change-Id: I4ccb748421470e2ccd3508d69fc317e12c27ff9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2219597Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773346}